2 tbsp butter
2 tbsp flour
1 cup milk
good handful grated cheese (1/2 - 1 cup)
tbsp wholegrain mustard (optional)
- Melt butter in saucepan. When melted add flour and briskly stir in - this makes what is called a roux. Add half of the milk, stirring constantly, so the mixture binds and is free of lumps.
- Add rest of milk, grind in some salt and pepper and mix thoroughly.
- Add cheese and mustard, stir through. Continue to stir as sauce thickens.
- Turn off heat, sauce will continue to thicken.