Begin by seasoning the flank steak with salt and pepper, and in a large Crock Pot, combine the steak, bell pepper, onions, ginger, and garlic. Mix beef broth, soy sauce, brown sugar, rice wine vinegar, and sesame oil separately. Season with salt and pepper, then add to the Crock Pot.
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Place the lid on the Crock Pot and cook on high for 3.5 to 4 hours or on low for 5 to 6 hours, until the steak becomes exceptionally tender. Take out the pieces of garlic and ginger.
Step 3
For a thicker sauce (optional): Mix cornstarch with 1/4 cup of cooking liquid to create a slurry. Stir it into the Crock Pot, cover, and cook on high for 10 to 15 minutes until the sauce thickens.
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Finally, serve the dish over rice and top it with sliced scallions and white sesame seeds for garnish.
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