Fresh Spring Rolls

Makes about 3 dozen 1 heaping tablespoon each: minced fresh ginger and garlic 1 tablespoon each: sugar and Vietnamese fish sauce 2 tablespoons vegetable oil Ground black pepper 1 pound boneless, skinless chicken thighs 1 head green leaf lettuce, separated into leaves, ribs mostly removed 1 seedless cucumber, cut crosswise into thirds and then into...