simple and cheeesy!
1. Grate the chhese on a chopping board.
2. Place the margarine or butter, flour and milk into a small saucepan.
3. Bring the sauce to a boil, whisking it all the timeuntil it has thickened.
4. Reduce the heat and allow to simmer for 2 minutes.
5. Stir in the grated cheese.