Preheat the Oven to 200 degrees. Heat the oil in a large frying pan and cook the onions until softened. Add the mince and chirizo sausage and cook until browned all over. Pour in the beans and add tomatoes and simmer for 20 minutes. Cook pasta shells in boiling water according to the packet instructions, then drain and add to the sauce. Mix well and spoon into a large ovenproof dish. Spread the cheese of choice over the top and bake 15 minutes or until cheese is golden brown. Serve immediately with a side salad.
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