Soak the rice vermicelli in lukewarm water to cover in a bowl, until rehydrated and softened, about 15 minutes. Drain and squeeze the noodles to get rid of the excess water. Bring a pot filled with water to a boil over high heat. Place the rice vermicelli in a sieve and lower it into the boiling water for 5 seconds. Remove the vermicelli and transfer to a bowl. When cool enough to handle, divide the vermicelli into 12 equal portions. In the same boiling water, cook the shrimp until they turn opaque, about 1 minute. When cool enough to handle, cut in half lengthwise and de-vein. Pour lukewarm water, about 1 inch deep, into a square or rectangular dish. Separate and soak 4 wrappers at a time until pliable, about 5 minutes. Place a clean kitchen towel on your work surface, then place each rice paper on the towel. With another kitchen towel, gently blot each wrapper until it is no longer wet but remain sticky. Leaving 1 inch uncovered on the side closest to you and the adjacent sides, place a lettuce leaf, vermicelli portion on top, 3 shrimp halves (overlapped), 2 avocado and 2 mango slices (overlapped), 2 mint leaves, and some cilantro sprigs. Fold wrapper once over the filling, then fold in the sides, and continue rolling tightly to the end. Repeat this process with the remaining ingredients to make 12 rolls. Wrap in a damp towel or with plastic wrap until ready to eat. Serve with Chile-Mint Dipping Sauce.
Chile-Mint Dipping Sauce
Combine all ingredients when syrup is cold. The sauce should be tangy, sweet, and spicy.