Name: Keto Pepper Steak Stir Fry Recipe
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Cuisine: Asian
Ingredients: 1/4 cup (60 g) beef broth; 1/4 cup (58 g) tamari; 1 1/2 tbsp toasted sesame oil; 1 tbsp chili garlic sauce or Sriracha; 4 cloves garlic, minced; 1/2 tsp ground ginger; 1/2 to 3/4 tsp glucomannan or 1/4 tsp xanthan gum; 2 lb (907.18 g) flank or top sirloin steak, thinly sliced; 2 tsp baking soda; 2 to 3 tbsp avocado oil, divided; 1/4 large onion, thinly sliced; 1 large red bell pepper, thinly sliced; 1 large green bell pepper, thinly sliced; Salt and pepper, to taste

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I absolutely love sharing this Keto Pepper Steak Stir Fry Recipe because it hits all the right notes for a low-carb, flavor-packed meal. The tender slices of steak combined with crisp colorful peppers and a bold, savory sauce make it a dish that feels special while still being easy enough for an everyday dinner. Every time I make it, the aromas fill my kitchen and everyone at the table keeps asking for seconds. This stir fry has become one of my favorite go-to meals when I want something hearty, healthy, and bursting with flavor.

Why You’ll Love This Keto Pepper Steak Stir Fry Recipe

To me, this recipe is all about the incredible balance of flavors. The rich umami from the beef broth and tamari mingles with the fragrant toasted sesame oil, while the chili garlic sauce gives just the right amount of heat and kick. Fresh garlic and ginger bring that aromatic touch that makes each bite so satisfying. The juicy red and green peppers add a natural sweetness and vibrant color that brightens the dish, turning simple ingredients into something memorable.

What really excites me about this Keto Pepper Steak Stir Fry Recipe is how fast and straightforward it is to prepare. I love that the baking soda tenderizes the steak quickly, making the meat perfectly juicy and silky without any fuss. Using a wok or large skillet means you’re cooking everything in one pan, so there’s minimal cleanup. This recipe is perfect for weeknight dinners when I want a delicious homemade meal without spending hours in the kitchen. Plus, I enjoy serving it for casual gatherings or anytime I want to impress family and friends with minimal effort.

Ingredients You’ll Need

The image shows four containers with ingredients on a white marbled surface. At the bottom right is a bowl filled with thinly sliced raw beef, the beef pieces are dark red with some white fat parts, and the bowl is white with an orange patterned inside. To the top left, there is a clear glass bowl filled with sliced green and red peppers, the peppers are long and thin. Above the beef bowl is a small white measuring cup holding thinly sliced white onions, which look soft and curvy. To the top right, there is a clear glass measuring cup filled with a dark brown stir fry sauce. The containers are spaced evenly, and the overall scene is bright and clean. photo taken with an iphone --ar 4:5 --v 7

Gathering the ingredients for this stir fry is surprisingly simple, yet each one plays a key role in building amazing taste, texture, and vibrant color. These essentials come together effortlessly to create a dish that’s anything but ordinary.

Beef broth: Adds deep savory notes that enhance the sauce’s richness.
Tamari: Provides soy flavor while keeping it gluten-free and appetizing.
Toasted sesame oil: Brings a nutty aroma and depth to the stir fry.
Chili garlic sauce (or Sriracha): Offers a spicy, garlicky punch that wakes up the palate.
Garlic, minced: Infuses the dish with fresh boldness and complexity.
Ground ginger: Adds a warm, slightly peppery zing that brightens everything.
Glucomannan or xanthan gum: Acts as a natural thickener for the sauce, giving it a luscious texture.
Flank or top sirloin steak, thinly sliced: The star protein that’s tenderized for maximum enjoyment.
Baking soda: The secret trick to tenderizing the beef quickly and effectively.
Avocado oil: Has a high smoke point perfect for searing and stir frying without burning.
Onion, thinly sliced: Adds subtle sweetness and balance.
Red and green peppers, thinly sliced: Provide crisp texture and vibrant color.
Salt and pepper: To season and enhance all the natural flavors in the dish.

Directions

Step 1: Whisk together the beef broth, tamari, toasted sesame oil, chili garlic sauce, minced garlic, ground ginger, and your choice of glucomannan or xanthan gum in a small bowl. Set this flavorful sauce mixture aside while you prep the steak.

Step 2: In a large bowl, toss the thinly sliced steak with the baking soda until evenly coated. Let it sit for 15 minutes—this simple step is magic for tenderizing the meat. Afterward, rinse the steak thoroughly under cool water to remove excess baking soda, then drain and pat dry with paper towels to get the best sear.

Step 3: Heat 1 tablespoon of avocado oil in a large skillet or wok over medium-high heat. Place a single layer of steak slices in the pan and sear each side for about 1 minute. You want a nice browned crust without overcooking. Remove the cooked steak to a plate and repeat this process, adding more oil as needed, until all the steak is cooked to your preferred doneness.

Step 4: Add the sliced onion and colorful red and green peppers to the same pan. Stir fry them for 2 to 3 minutes, just until they soften slightly but still retain some crunch. This keeps the texture lively and fresh.

Step 5: Return the cooked steak and any juices that have gathered on the plate back into the pan with the vegetables. Pour in the prepared sauce and stir everything together. Continue cooking until the sauce thickens, coating the meat and veggies beautifully.

Step 6: Taste and season with salt, pepper, and if you like, an extra splash of chili garlic sauce for more heat. Just before serving, sprinkle a handful of toasted sesame seeds on top for a delightful finishing touch and added texture.

Servings and Timing

This Keto Pepper Steak Stir Fry Recipe serves about 4 people generously, which is perfect for a family dinner or meal prepping for the week. Prep time takes roughly 20 minutes, including the tenderizing and slicing. Cook time is quick — about 10 to 15 minutes from start to finish. Altogether, you’re looking at under 40 minutes total time, no resting or cooling required, which makes this dish wonderfully efficient for busy days.

How to Serve This Keto Pepper Steak Stir Fry Recipe

A white bowl filled with three main layers: the bottom layer is white cauliflower rice with a fluffy texture, on top of that are slices of cooked dark brown beef pieces mixed with vibrant red and green bell pepper strips and some light green onion slices, all sprinkled lightly with white sesame seeds. The bowl sits on a white marbled surface, and a pair of black chopsticks rests on top of the bowl. In the background, there is a white bowl filled with more beef and bell peppers, slightly out of focus. photo taken with an iphone --ar 4:5 --v 7

Whenever I serve this stir fry, I like to keep things simple so the bold flavors and textures shine. It’s fantastic on its own for a low-carb meal, but pairing it with a fresh side like cauliflower rice or sautéed greens really completes the plate. The mild, fluffy cauliflower rice soaks up the sauce beautifully and keeps everything keto-friendly.

For presentation, I love garnishing with extra toasted sesame seeds and freshly chopped green onions to add a pop of color and subtle crunch. Serving in wide, shallow bowls helps showcase the colorful peppers and juicy steak slices, inviting everyone to dig in. If you want to elevate the plating for a special occasion, a small wedge of lime on the side adds a refreshing brightness that guests appreciate.

As for drinks, I usually opt for something crisp and light—sparkling water with a squeeze of lemon or a chilled dry white wine pairs beautifully. If you prefer cocktails, a ginger-infused margarita or a classic mojito complements the dish’s spicy and savory notes perfectly. This meal is wonderful piping hot and is best enjoyed fresh, right off the stove, when the sauce has that perfect velvety consistency.

Variations

I enjoy experimenting with this Keto Pepper Steak Stir Fry Recipe by swapping ingredients to suit different tastes or dietary needs. For example, if you don’t eat beef, thinly sliced chicken breast or turkey can work well with the same marinade and sauce, though the cook time will be shorter. For a vegetarian twist, tofu or seitan stir-fried until crispy adds protein while keeping the flavor vibrant.

If you want to turn this dish gluten-free, just make sure your tamari is certified gluten-free, and you’re good to go. For those avoiding nightshades, swapping bell peppers with crunchy zucchini or asparagus makes a pleasant alternative while keeping the texture contrast. To add complexity, I sometimes add mushrooms or water chestnuts for extra earthiness and bite.

For a different cooking method, try spreading the marinated steak slices on a hot grill pan for a smoky char before combining with the veggies in the skillet and sauce. Or, make the sauce more mild or fiery by adjusting the chili garlic sauce to your preference. This flexibility makes the dish perfect for customizing to whatever mood I’m in.

Storage and Reheating

Storing Leftovers

Leftovers from this Keto Pepper Steak Stir Fry keep beautifully in the fridge when stored in an airtight container. I find that glass containers work best for maintaining freshness and making reheating easy. You can expect the flavors to stay delicious for up to 3 to 4 days, which is great for quick lunches or easy dinner the next day.

Freezing

If you want to freeze leftovers, this recipe freezes fairly well but the texture of the peppers may soften a bit after thawing. To freeze, portion the stir fry into freezer-safe containers or heavy-duty freezer bags, removing as much air as possible. It will keep well in the freezer for up to 2 months. When ready to eat, thaw slowly in the fridge overnight for best results.

Reheating

To reheat, I prefer stirring the leftovers in a skillet over medium heat, adding a splash of water or beef broth to loosen the sauce and help rehydrate the veggies just a little. Avoid microwaving if possible, as it can make the steak tough and the peppers soggy. This gentle reheating keeps the texture closer to freshly cooked and revives those delicious flavors.

FAQs

Can I use a different cut of steak for this stir fry?

Absolutely! Flank steak and top sirloin work best because they’re lean and tender with good flavor. However, you can substitute with skirt steak or even ribeye for more fat and richness, just slice thinly against the grain for the best tenderness.

What can I substitute for tamari if I don’t have it?

If you don’t have tamari, soy sauce is a good alternative, though it may contain gluten. Coconut aminos is another excellent gluten-free and lower-sodium substitute that keeps the umami flavor intact.

Is it necessary to use baking soda to tenderize the steak?

Using baking soda is a quick trick I love to ensure tender meat in just 15 minutes without extra marinade time. You can skip it, but the steak might not be quite as tender or silky, especially with lean cuts like flank steak.

Can I make this recipe vegan?

Yes! Swap the beef with firm tofu or seitan, and replace beef broth with vegetable broth. Use gluten-free tamari to keep it allergen-friendly. The sauce and veggies remain the same, so you still get plenty of flavor and texture.

How spicy is the dish, and can I adjust it?

The heat level depends on how much chili garlic sauce or Sriracha you add. I recommend starting with 1 tablespoon and adjusting after tasting the finished dish. You can omit it altogether for a milder version or increase it for a bold spicy kick.

Conclusion

I hope you feel as excited to make this Keto Pepper Steak Stir Fry Recipe as I do every time I prepare it. It’s a delicious, approachable dish that never disappoints, balancing tender steak, fresh veggies, and a savory sauce perfectly. Whether you’re cooking for yourself, family, or friends, it’s sure to become a fast favorite that you’ll come back to again and again.