01 - Soak rice vermicelli noodles in hot water for 5-7 minutes until tender. Drain thoroughly and rinse with cold water to stop cooking. Set aside in a colander.
02 - Julienne the carrot and cucumber, removing cucumber seeds. Wash and dry all fresh herbs. Arrange shrimp, lettuce, herbs, and prepared vegetables on a work surface in separate piles for easy assembly.
03 - Fill a large shallow bowl with warm water. Submerge one rice paper wrapper for 5-8 seconds until pliable but not fully softened. Remove and lay flat on a damp kitchen towel or cutting board.
04 - Layer lettuce, noodles, carrot, cucumber, and herbs on the bottom third of wrapper. Place 2-3 shrimp halves cut-side up. Fold bottom over filling, fold in sides, then roll tightly but gently to seal. Repeat for remaining wrappers.
05 - Whisk peanut butter, hoisin sauce, soy sauce, lime juice, sriracha (if using), and warm water in small bowl until smooth. Add more water to reach desired dipping consistency.
06 - Slice rolls in half diagonally if desired. Arrange on platter with peanut sauce on the side. Serve immediately while rice paper remains fresh and pliable.