Mashe potato or mashed potatoes is a common way of serving potato in many countries worldwide. It is made by mashing boiled potatoes (peeled or unpeeled) with a potato ricer, fork or similar device. Other ingredients such as milk, cream, butter, vegetable oil, garlic, cheese, bacon bits or sour cream are often added to enrich the mash. A French variation adds egg yolk for Pommes duchesse that is piped through a pastry tube into wavy ribbons and rosettes, brushed with butter and lightly browned.