1 - Bring water to a boil and add the broken-up macaroni, elbows, and salt.

2 - Cook uncovered until tender but not overcooked (about 8 minutes).

3 - Preheat a moderately hot oven to 350F, 180C, or Gas Mark 4.

4 - Drain the macaroni thoroughly, put it back into the same hot saucepan cooked in, and mix in the butter.

5 - Grate the cheese and mix it with the macaroni while it is still warm.