Traditional Bubble and Squeak

I made mine with Cabbage, Zucchini, Mashed Potatoes, Onions.

• 6 tablespoons butter (unsalted)
• 1/2 cup onion (finely chopped)
• 1 pound mashed potatoes
• 1 cup leftover vegetables (i.e., cabbage, kale, peas, cooked swede, cooked carrots, and/or cooked Brussels sprouts; finely chopped)
• Salt, to taste
• Freshly ground black pepper, to taste
• For serving: fried or poached eggs, bacon pieces, leftover roast, and/or ham pieces 

Gather the ingredients.

In a large frying pan, melt the butter over medium heat (you can also use vegetable oil, but butter tastes better) and make sure it doesn't brown. Add the finely chopped onion and fry gently for about 3 minutes or until soft and translucent.

Turn the heat up ever so slightly and add the mashed potato and all of the chopped up leftover vegetables. Fry for at least 10 minutes, turning them over continuously in the melted butter to ensure that the potato and vegetables are thoroughly reheated. You are also aiming to brown (but not burn) the outside edges of the vegetables, so occasionally press the mixture into the pan to brown a little before turning.

Finally, when the mixture is heated right through, give the vegetables one long final press onto the base of the pan with a spatula and leave to cook for 1 minute. Flip over and repeat.

Serve with either a fried or poached egg on top, bacon pieces or ham pieces, or any leftover roast mixed in and reheated thoroughly.

Tip: Make bubble and squeak patties. Mix the potato and vegetables and then form into small patties and fry until crisp on both sides.

Source: Spruce Eats