The sea is the source of many Dutch specialities, such as fresh fish, mussels and oysters. Dutch cheeses, such as Gouda and Edam, are world famous. A wide variety of vegetables are available. In spring, white asparagus is on many a restaurant menu. Traditional Dutch cuisine is very simple. Breakfast and lunch consist of sandwiches: cheese, sausage, peanut butter or jam. Popular hot meals in winter are stamppot (mashed potatoes mixed with cabbage) and pea soup (made with split peas, onion, leek, smoked sausage and bacon).