Jo Jo's Meatloaf

Preheat Oven to 350F In a large skillet, melt the butter over medium-low heat. Add the onion and saute until translucent, about 5 minutes. Remove from the heat and let cool. In a large bowl, combine the beef, cooled onion, saltine crumbs, Cheddar, eggs, tomato sauce, Worcestershire sauce, salt and pepper. Use your hands to gently mix the ingredients together until well blended. Try to keep a light touch and not overwork the mixture. On a 9 x 13" or other large baking pan, form the mixture into a roughly 6 x 9" loaf. Drizzle the ketchup down the center of the loaf and brush it over the top to cover. Bake until firm (170F on an instant-read thermometer) about 1 hour. Let stand 10 minutes before slicing. Serve warm.