What British snack consists of mashed potato mixed with cabbage or other vegetables and fried?

The British dish of mashed potato mixed with cabbage or other vegetables and fried is bubble and squeak.

The mixture is cooked in a frying pan until the underside develops a browned crust. Leftover potatoes and vegetables from a Sunday roast are especially associated with the dish, making it a classic example of economical British cooking. Cabbage is traditional, but carrots, peas, Brussels sprouts, and other vegetables may appear.

The unusual name refers to sounds produced as the mixture cooks in the pan. The dish was documented in British cookery by the eighteenth century, when it could contain meat as well as vegetables.

Bubble and squeak is not the same as Scottish rumbledethumps, which commonly combines mashed potatoes, cabbage, and cheese and is baked or browned as a regional Scottish dish. The British dish’s defining idea is fried leftover vegetables and potato.