Coarsely chop peppers. Place in food processor or blender and puree. Add beans, tomato paste, garlic, mayonnaise, oregano, cumin and chili powder or cayenne. Process to smooth puree. Season to taste with salt and pepper. Let stand one hour before serving. Keeps up to 3 days, tightly covered and refrigerated. Makes 2 1/4 cups.
Per 2 tablespoons: 32 calories, <1 g total fat (<1 g saturated fat), 6 g carbohydrate, 1 g protein, 1 g dietary fiber, 120 mg sodium.