Fork-tender beef and sweet bell peppers in a glossy, savory-sweet soy-ginger sauce that tastes like your favorite takeout—made easy in the slow cooker.
Step 1: Slice the beef for tenderness
Slice beef across the grain into thin strips (about 1/4-inch/6mm). Thin slices + slow cooking = tender strands that still feel like “pepper steak,” not shredded pot roast.
Step 2: Build the sauce
In a bowl, whisk together soy sauce, broth/water, brown sugar, vinegar, sesame oil, garlic, ginger, black pepper, and red pepper flakes (if using) until the sugar dissolves.
Step 3: Load the slow cooker
Add beef, onion, and **half** the bell peppers to the slow cooker (reserve the remaining peppers for later so they stay crisp-tender). Pour sauce over and toss well.
Step 4: Slow cook
Cover and cook:
Step 5: Thicken to a glossy stir-fry sauce
In a small bowl, mix cornstarch with cold water to make a slurry. Stir it into the slow cooker. Add the **remaining bell peppers**, cover, and cook **30 minutes on High** (or **45 minutes on Low**) until the sauce is glossy and coats the beef, and the peppers are crisp-tender.
Step 6: Final taste + serve
Taste and adjust: more pepper for “pepper steak” punch, a pinch of salt if needed (often not necessary due to soy). Serve hot.
| Calories | 430 kcal |
| Protein | 35g |
| Carbs | 28g |
| Fat | 18g |