Larb Burgers

Name: Larb Burgers
Ingredients: For the larb burgers:; 1 shallot, roughly chopped; 3 garlic cloves; 8 kaffir lime leaves, sliced; 1 stalk lemongrass, roughly chopped; 1 tablespoon fish sauce; one 1-inch piece ginger or galangal; 1 pound boneless, skinless chicken thighs; 1 bunch green leaf lettuce; For the peanut sauce:; 7 ounces coconut milk; 1/2 cup creamy peanut butter; 2 teaspoons fish sauce; 1/2 teaspoon chile paste; 2 teaspoons palm sugar simple syrup; 1/3 cup water