Mango Shrimp Summer Rolls

INGREDIENTS

• 1 seedless cucumber (usually plastic-wrapped; 1 lb), peeled, cored, and cut into 1/8-inch-thick matchsticks
• 1/2 teaspoon salt
• 3 tablespoons Asian fish sauce such as Thai or Vietnamese *
• 3 scallions, cut into 3-inch-long julienne strips
• 1 pound firm-ripe mango, peeled, pitted, and cut into 1/8-inch-thick matchsticks
• 3 tablespoons rice vinegar
• 3 tablespoons fresh lime juice
• 48 fresh mint leaves (from about 1 bunch)
• 3 ounces vermicelli rice-stick noodles*
• 2 tablespoons sugar
• 12 large shrimp in shell (21 to 25 per pound), peeled
• 2 1/2 teaspoons packed brown sugar
• 2 tablespoons water
• 48 fresh cilantro leaves (from about 1 bunch)