Heat oven to 350 degrees. Combine all ingredientsin large bowl; mix lightly but thoroughly. Bake 50-55 minutes or until meatloaf is to medium doneness. (Beef 160 degrees, Turkey 170).
Twenty minutes before the meatloaf is done, drain off grease and liquid. Cover the meatloaf with 1/2 cup of the grated onion. Mix the remaining sauce ingredients in a pan and heat slightly, do not boil. Brush on top of meatloaf. If you like more sauce you can always double the ingredients. Let stand 5 minutes before slicing.