red pepper flakes, optional
Brown ground beef in 2 tablespoon hot oil in frying pan.
When almost browned, add onion and continue browning until onion is tender.
Pour meat and onion into 3 1/2 quart crockpot.
Add puree, sauce, paste, water, salt, pepper and oregano and set dial on low setting.
Cut 2 pounds of sausage (Italian links or country style) into pieces and brown in remaining 2 tablespoons oil.
When brown, place sausages in sauce in crockpot.
Continue cooking for 12 hours.
(If you like your sauce sweeter, you could add 1/4 to 1/2 cup sugar to this.)