Vegetable Summer Rolls

Name: Vegetable Summer Rolls
Ingredients: 3 tablespoons finely chopped onion; 1 small garlic clove, minced; 3/4 teaspoon dried hot red pepper flakes; 1 teaspoon vegetable oil; 3 tablespoons water; 1 tablespoon creamy peanut butter; 1 tablespoon hoisin sauce; 1 teaspoon tomato paste; 3/4 teaspoon sugar; 1 ounce bean thread noodles (cellophane noodles); 1 tablespoon seasoned rice vinegar; 4 (8-inch) rice-paper rounds, plus additional in case some tear; 2 red-leaf lettuce leaves, ribs cut out and discarded and leaves halved; 1/4 cup fresh mint leaves; 1/4 cup fresh basil leaves (preferably Thai); 1/2 cup thinly sliced Napa cabbage; 1/4 cup fresh cilantro leaves; 1/3 cup coarsely shredded carrot (1 medium)