Bubble & Squeak

Ingredients:

1 ounce Butter.
1 Finely chopped Onion.
1 pound Cooked and mashed Potatoes.
8 ounces Cabbage.
6 slices Beef, cooked and finely chopped (optional). 

Directions:

Melt the Butter in a large frying pan Add the Onion and fry for a few minutes until softened, stirring frequently.
Add the potatoes and Cabbage, if you are including the beef, add this as well.
Fry over a medium heat for 15 minutes until brown then serve.
This classic dish originally contained beef along with the left over cooked potatoes and cabbage, though today people don't generally bother with the meat.
The name is apparently due to the sounds that are emitted during cooking, the vegetables bubble as they are boiled and then squeak in the frying pan.