Step 1

Whisk 1/4 cup rice vinegar with 2 teaspoons sugar in a medium bowl until the sugar dissolves. Add the chicken and carrot, season with salt to taste and set aside.

Step 2

Fill a large bowl with warm water. Working with 2 sheets of rice paper at a time (keep the others covered with a barely damp cloth to prevent curling), immerse the papers in the warm water until slightly softened (about 15 seconds). Remove and spread out on a clean surface or cutting board. Pat dry with a towel to remove excess water.

Step 3

Lay 2 pieces of lettuce over the bottom third of the rice paper, leaving about 1/2 inch clear on the edges. Place about 1/3 cup of the chicken-and-carrot mixture on the lettuce, top with 4 to 5 pieces of cucumber and scallion, several mint leaves and about 1 heaping tablespoon of rice.

Step 4

Roll up the paper halfway into a cylinder. Fold both edges in to tuck while continuing to roll the paper to seal. Place the rolls on a plate covered with a damp towel so they stay moist as you prepare the remaining rolls. Cut the rolls in half.

Step 5

Whisk the peanut butter, soy sauce, 3 tablespoons of water and the remaining 1 to 2 tablespoons of rice vinegar and 2 teaspoons sugar in a medium bowl until smooth. Serve the rolls with the dipping sauce immediately.