Grilled Duck Laab

Name: Grilled Duck Laab
Ingredients: Four 7-ounce skin-on duck breasts; Kosher salt and freshly ground black pepper; 1/2 cup toasted rice powder; 1/3 cup chopped lemongrass; 1/4 cup fish sauce; 1/4 cup chopped shallots; 3 to 4 Thai bird chiles, chopped; Juice of 3 limes; 2 cloves garlic, minced; 1/3 cup bean sprouts; 1/3 cup matchstick-sliced carrots; 1/3 cup fresh cilantro leaves, chopped; 1/3 cup finely chopped scallion; 10 to 12 fresh mint leaves; 10 to 12 Thai basil leaves; Purple radishes, sliced, for garnish; Watermelon radishes, sliced, for garnish; 10 to 12 butter lettuce leaves