Morusa or morusa de pallares is a traditional dish originating from Peru. This lima bean purée is made with a combination of lima beans, butter, salt, and pepper. The beans are covered with water in a large pot, then cooked over medium heat for a few minutes until the skin comes off easily.
They are drained, the skin is taken off, and the beans are then cooked until fully tender. Later on, the lima beans are blended with the cooking liquid, forced through a sieve, then mixed with butter and seasoned with salt and pepper. Morusa is typically served hot as an accompaniment to meat dishes.