Heat olive oil in a large skillet over medium-high heat. Add beef, pork, onion, green pepper, and garlic and saute until browned, about 10 minutes. With a slotted spoon to drain off the fat, place the sauteed ingredients in a 4 litre saucepan. Add the remaining ingredients and mix well. Slowly bring to a boil, reduce heat, cover, and simmer for 2 hours.