Boil pasta in abundant salt water until "al dente".
When the pasta is dropped in the water, melt butter in a skillet,
add vodka and chili pepper and stir for 2 minutes.
Add tomatoes, which have been drained, pureed and strained to
remove all seeds, and salt.
Stir for 5 minutes.
When pasta is cooked, drain well and return it to the pot, over
low fire. Add sauce and cheese and mix well.
Serve immediately, possibly in preheated deep dishes.