Method

1. Put the cheese, flour, mustard, Worcestershire sauce, margarine and pepper into a saucepan
2. Mix well and then add the milk to moisten. Do not make it too wet
3. Stir over a gentle heat until all is melted, and when it is a slightly thick paste, stop stirring, and swivel it around the saucepan, which it will do quite easily
4. Leave to cool a little, and meanwhile toast the bread on one side only
5. Spread the rarebit over the untoasted side and brown under a hot grill
6. This mixture can be made and kept in the refrigerator for several days if required