Heat 1 tablespoon of vegetable oil in a 2-quart saucepan. Stir in scallions and green peppers. Sauté 1 minute. Add 1 crushed garlic clove, stirring briefly.
Mix in tomato sauce, beans, and hot pepper sauce. Simmer uncovered over medium-low heat for 15 minutes until thickened, stirring occasionally.
Meanwhile, heat 2 remaining tablespoons vegetable oil in a skillet. Add chopped vegetarian sausage, fresh tomato, chili powder, vinegar, salt, and remaining crushed garlic clove. Cook and stir over medium heat for 8 to 10 minutes.
Combine bean and vegetarian sausage mixtures. Spread about ½ cup over each tortilla. Sprinkle with cheese. Place under a preheated broiler just until cheese melts.
Roll and arrange seam-side down on a serving plate. May be eaten plain or served topped with sprouts, taco sauce and a spoonful of sour cream or guacamole.