bubble and squeak

British breakfast dish made with the shallow-fried leftover vegetables (cabbage, carrots, peas, Brussels sprouts, etc.), mashed potatoes, and sometimes cold chopped meat

Bubble and squeak is an English dish made from cooked potatoes and cabbage, mixed together and fried. The food writer Howard Hillman classes it as one of the "great peasant dishes of the world". The dish has been known since at least the 18th century, and in its early versions it contained cooked beef; by the mid-20th century the two vegetables had become the principal ingredients.