Put the pasta in a pan of salted water. Get rid of half the juice from the tomatoes (keep the juice in a bowl, becuase it might be needed) and put them in a bowl. Finley chop the onions and slice the mushrooms to size. After make the cheese sauce using a recipe of the internet. After pasta is cooked, drain water and add the cheese sauce and the tomatoes with the onions and the mushrooms. Add any wanted seasoning when being served. Servede piping hot! Enjoy my creation! If the sauce goes pink then thats perfect! If it is not pink yet add the rest of the tomatoe juice.