Combine the tomato sauce, barbecue
sauce and sugar in a small saucepan over medium heat. Heat the mixture
until it begins to bubble, stirring often, then remove it from the heat.
In a large bowl, add all but 2 tablespoons of the tomato sauce
to the meat. Use a large wooden spoon or your hands to work the sauce
into the meat until it is very well combined.
remaining ingredients with the ground sirloin: flour, salt, onion powder
and ground pepper. Use the wooden spoon or your hands to work the spices
and flour into the meat.
Load the meat into a loaf pan
(preferably a meatloaf pan with two sections which allows the fat to
drain, but if you don't have one of those a regular loaf pan will work).
Wrap foil over the pan and place it into the oven for 30 minutes.
After 30 minutes, take the meatloaf from the oven, remove the foil
and, if you aren't using a meatloaf pan, drain the fat.
knife, slice the meatloaf all the way through into 8 slices while it is
still in the pan. This will help to cook the center of the meatloaf.
Pour the remaining 2 tablespoons of sauce over the top of the meatloaf,
in a stream down the center. Don't spread the sauce.
meatloaf back into the oven, uncovered, for 25-30 minutes or until it is
done. Remove and allow it to cool for a few minutes before serving.