Vegetable Summer Rolls

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 For summer rolls

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)