Preheat the oven to 350-degrees (F).
Put the ground beef and ground pork into a large mixing bowl. Add in the tomato sauce, bread, sage, egg and onion.
Add 3 tablespoons of ketchup and 3 tablespoons of barbeque sauce, and mix the ingredients well.
Put the meat mixture into a 9x13 baking dish. Flatten it out to the same thickness throughout and leave a small space between the sides of the dish and the meat.
Spread the tomato paste over the top of the meat. Then cover with aluminum foil and baked for 45 minutes.
About 5 minutes before the meatloaf is finished with the first round of baking, mix together 2 tablespoons brown sugar, 2 tablespoons ketchup and 2 tablespoons barbeque sauce to form the ketchup glaze.
Remove the meatloaf from the oven. If desired, drain some of the grease from the meatloaf. Then spread the glaze over the top of the tomato sauce.
Put the meatloaf back into the oven, uncovered, for an additional 15 minutes.
Remove the meatloaf from the oven and let it set for five minutes before slicing and transferring to another plate to serve.