SLOW COOKER BEEF STRIPS WITH PEPPERS & ONIONS

Slow Cooker Beef Strips with Peppers & Onions

The Culinary Science of Slow Cooking Tough Cuts

1. Collagen Breakdown: Slow, low-heat cooking over 6 to 8 hours melts the tough connective tissue (collagen) in the meat, transforming it into gelatin that creates an exceptionally tender texture.
2. Deep Flavor Integration: As the beef simmers alongside the aromatics, soy sauce, and broth, the liquids reduce and concentrate into a deeply savory, umami-rich glaze that coats the peppers and onions.

Ingredients

• The Beef & Veggies:
  • 2 lbs flank steak, top round, or sirloin steak, sliced into thin strips
  • 2 large bell peppers (a mix of red and green), sliced into thick strips
  • 1 large yellow onion, sliced into wedges or thick strips
  • 3 cloves garlic, minced
• The Savory Sauce:
  • 3/4 cup low-sodium beef broth
  • 1/3 cup low-sodium soy sauce (or tamari)
  • 2 tablespoons Worcestershire sauce
  • 2 tablespoons tomato paste (for depth and a touch of sweetness)
  • 1 tablespoon brown sugar (optional, to balance the savory saltiness)
  • 1 teaspoon black pepper
• The Thickening Slurry (Added at the end):
  • 2 tablespoons cornstarch
  • 3 tablespoons cold water

Step-by-Step Instructions

1. Layer the Slow Cooker

1. Place the sliced onions, minced garlic, and bell pepper strips directly into the bottom of your slow cooker.
2. Lay the sliced beef strips evenly right over top of the vegetables. (As it cooks, the meat will release juices down into the veggies).

2. Mix and Pour the Sauce

1. In a medium measuring cup or bowl, whisk together the beef broth, soy sauce, Worcestershire sauce, tomato paste, brown sugar, and black pepper until smooth.
2. Pour the sauce mixture evenly over the beef and vegetables in the slow cooker.

3. Slow Cook

1. Cover with the lid and cook on LOW for 6 to 7 hours (or on HIGH for 3 to 4 hours), until the beef strips are pull-apart tender and the peppers have softened into the sauce.

4. Thicken the Gravy

1. In a small bowl, whisk together the cornstarch and cold water until completely dissolved (making a slurry).
2. Stir the slurry directly into the slow cooker liquid.
3. Put the lid back on and cook on HIGH for 15 to 20 minutes, until the sauce bubbles up and thickens into a glossy, rich gravy that clings to a spoon.

5. Serve

1. Give everything a good final stir to coat the beef, peppers, and onions in the thick sauce.
2. Serve hot over a bed of steamed white jasmine rice, garlic butter noodles, or mashed potatoes!

Pro-Tips for Success

• Slice Against the Grain: When cutting your raw steak into strips, look at the direction of the muscle fibers (the grain) and slice perpendicular to them. This shortens the muscle fibers and guarantees the tenderest possible bite after slow cooking.
• Add Heat: If you like a little kick, toss in a pinch of red pepper flakes or a spoonful of garlic-chili paste right into the sauce mixture before cooking.