1 green bell pepper, chopped
1 yellow onion, chopped
2 tablespoons olive oil
2 tablespoons chicken stock (Optional)
1 pound ground beef
3 tablespoons taco seasoning
2 large roma (plum) tomatoes, chopped
½ teaspoon salt
1 (8 ounce) package shredded Cheddar cheese
12 large romaine lettuce leaves
Cook and stir green bell pepper and yellow onion in a skillet over medium heat with olive oil and chicken broth until onion is translucent, about 5 minutes.
Place ground beef in a separate skillet over medium heat. Cook and stir with taco seasoning until beef is browned and crumbly, 5 to 8 minutes. Drain excess grease.
Sprinkle tomatoes with salt in a bowl. Place Cheddar cheese into a separate bowl.
Fill each lettuce leaf with about 2 tablespoons beef filling; top with 1 to 2 teaspoons green pepper mixture, tomato, and about 1 1/2 tablespoons Cheddar cheese.
