The basis for bubble & squeak is cooked potatoes and greens. For some reason (probably psychological) it tastes much nicer if they have been cooked the day previously! This version contained potato, brussels sprouts and cabbage. Roughly mash together with a little margarine.
Then, in a large pan, lightly fry the mixture. You may, if you are really, really lucky, hear it 'squeak' over the heat (hence the name!). Ensure the mixture is heated through & serve.
I am particularly fond of bubble & squeak with vegetarian sausages and lashings of brown sauce. Or if I am feeling adventurous, a generous helping of piccalilli. 
Great, easy cooking for chilly evenings!
