No one's said it yet, but honestly, organ meat is the shit, bud.
Chicken hearts wrapped in bacon.
Lambs fry.
Crumbed and lightly fried brains.
Bulk out meaty dishes like stroganoff with kidney and heart.
Max nutrients, fuck all cost, and incredibly filling.
I also use rolled oats in saucy mince dishes to bulk them up and thicken the sauce. They take on the flavour of the sauce.