03Whisk the ketchup, sugar and vinegar in a bowl and brush a few tablespoonfuls over the meat. Add 1/2 cup water to the skillet, cover and simmer over low heat until cooked through, about 15 minutes.04Transfer the loaves to a plate. Add the remaining ketchup mixture to the skillet and cook over high heat, stirring, until thick, 3 to 5 minutes. Serve 4 meatloaves with the hot glaze, reserving 2 for quesadillas.