I sauteed 1/2 large onion, 1/2 large green pepper, 3 cloves garlic all chopped finely.
In one bowl, I mixed 1/2 can of tomato sauce, 1/2 cup milk, 2 eggs, some shots of hot sauce and worchestershire sauce (to taste)
In another bowl, I had 3/4 cup of oatmeal (the 5 minute cook kind, uncooked), 1/2 cup ground flax seeds, parsley, salt, pepper, a little red peper
In a large bowl mix 2 lbs beef (I used sirloin) and 1 lbs ground pork and all other ingredients dumped in. Just mix and squeeze the meats together, try to not over mix though. It will be sloppy messy and you will think it is too wet, but it isn't. On a foil lined pan, form the meat into a loaf shape and bake in oven (400) on lowest rack. You may want to oil foil before putting down, I didn't, and the crunchy bottom stuck a bit. I cooked it for 1.5 hours, insert a knife in the middle and if it comes out hot it is done.
Take the other half of your tomato sauce and put in sauce pan on stove, along with 3 TBS apple cider vinegar and 3 TBS brown sugar. I also added some shots of hot sauce and worchestershire sauce to it. Cook until thickened. On the last 15-20 minutes of the meatloaf, spoon over top. The rest, i served on the side. You can play with it to make it more tangy (more vinegar) or sweeter