Bubble and squeak (sometimes just called bubble) is a traditional English dish made with the shallow-fried leftover vegetables from a roast dinner. The chief ingredients are potato and cabbage, but carrots, peas, brussels sprouts, and other vegetables can be added. It is traditionally served with cold meat from the Sunday roast, and pickles. Traditionally the meat was added to the bubble and squeak itself, although nowadays the vegetarian version is more common. The cold chopped vegetables (and cold chopped meat if used) are fried in a pan together with mashed potato until the mixture is well-cooked and brown on the sides.
The name is thought to be either a description of the action and sound made during the cooking process, a reference to the gas "bubbles" the dish causes and the "squeak" one's body makes upon releasing them, or from the fact that the ingredients are leftovers; 'the bubble of the stew and the squeak of the pig'.
The name bubble and squeak is used throughout the UK — it is also Cockney rhyming slang for "Greek". In other parts of the country the dish may be referred to as bubble and scrape or fry up.