Slow-Cooked Mongolian Beef with Steamed Rice and Stir-Fry Vegetables

Ingredients:

For the beef:
– 2 pounds (900g) beef chuck roast, thinly sliced
– 1/4 cup cornstarch
– 2 tablespoons vegetable oil
– 4 cloves garlic, minced
– 1 teaspoon fresh ginger, grated
– 1/2 cup low-sodium soy sauce
– 1/2 cup water
– 1/2 cup brown sugar
– 1/2 teaspoon red pepper flakes (adjust according to your spice preference)