Spiced Beef Stir-Fry with Bell Peppers and Cauliflower Rice

By Lauren Mitchell, Test Kitchen Director · Reviewed by AislePrompt Editorial · Published 2026-06-28 · Updated 2026-06-28

A flavorful Whole30 beef stir-fry combining tender strips of beef with colorful bell peppers, served over fragrant cauliflower rice for a low-carb, satisfying meal. This asian fusion-inspired whole30 (whole30, low carb) ready in about 35 minutes pairs thinly sliced sirloin steak, coconut aminos, ground cumin for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 350 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 1 lb, thinly sliced sirloin steak
• 3 tbsp coconut aminos
• 1 tsp ground cumin
• 1 tsp ground coriander
• 1/2 tsp smoked paprika
• 1 tsp sea salt
• 1/2 tsp black pepper
• 2 tbsp extra virgin olive oil
• 1 large, sliced into 1/2-inch strips red bell pepper
• 1 large, sliced into 1/2-inch strips yellow bell pepper
• 1 small, thinly sliced medium onion
• 3 cloves, minced garlic cloves
• 1 tbsp, grated fresh ginger
• 4 cups cauliflower rice
• 1/4 cup chopped, for garnish fresh cilantro
• 4 wedges, for serving lime wedges

Instructions

1. Step 1: In a medium bowl, combine 1 lb thinly sliced sirloin steak with 3 tbsp coconut aminos, 1 tsp ground cumin, 1 tsp ground coriander, 1/2 tsp smoked paprika, 1 tsp sea salt, and 1/2 tsp black pepper. Toss to coat and set aside for 10 minutes.
2. Step 2: Heat 2 tbsp extra virgin olive oil in a large skillet over medium-high heat until shimmering. Add the marinated beef strips and sear for 3-4 minutes, stirring occasionally, until browned but not fully cooked. Remove beef from skillet and set aside.
3. Step 3: In the same skillet, add 1 small thinly sliced onion, 3 minced garlic cloves, and 1 tbsp grated fresh ginger. Sauté for 2 minutes until fragrant.
4. Step 4: Add 1 large red bell pepper and 1 large yellow bell pepper sliced into 1/2-inch strips. Stir-fry for 4-5 minutes until vegetables are tender-crisp.
5. Step 5: Return the beef to the skillet and cook together for another 2 minutes until beef is cooked through and flavors meld.
6. Step 6: Meanwhile, in a separate pan over medium heat, warm 4 cups cauliflower rice for 3-4 minutes until hot and slightly softened.
7. Step 7: Serve the beef and pepper stir-fry over the cauliflower rice, garnished with 1/4 cup chopped fresh cilantro and 4 lime wedges for squeezing.