Heat a casserole dish over medium-high heat and brown meat on all sides in hot oil.
In large bowl combine tomatoes, pizza sauce, cheese, Worcestershire sauce, garlic, salt, oregano and pepper. Pour over meat. Cover and simmer over medium heat for 2 hours, turning meat each half hour.
Remove meat from pan and cool slightly. Skim fat from pan juices. Measure juices and add enough water to make 6 cups liquid. Return liquid to casserole dish. Blend cornflour and 3 tablespoons cold water; stir into pan juices. Cook and stir till thickened and bubbly.
Slice meat thinly against the grain. Return meat to pot and add mushrooms. Simmer for 30 minutes longer.
Cook pasta in a large pot of boiling water until done. Drain. To serve, place meat slices over hot pasta and pour some sauce over. Pass remaining sauce.