Traditional Duck Confit Recipe

Name: Traditional Duck Confit Recipe
Ingredients: 4 duck legs (about 2 1/4 pounds total; 1kg) (see note); 1 tablespoon plus 1 teaspoon (16g) Diamond Crystal kosher salt; ; for table salt, use about half as much by volume or the same weight; 6 large shallots (12 ounces; 340g), quartered; 1 small onion (4 ounces; 110g), cut into 2-inch pieces (see note); 6 medium cloves garlic (30g); 1/2 bunch (2 ounces; 55g) flat-leaf parsley leaves and tender stems, roughly chopped; 10 sprigs fresh thyme; 2 teaspoons (6g) whole black peppercorns; 2 to 4 cups (475 to 950ml) rendered duck fat (see note)