Get some good potatoes, peel them, chop them up, boil them in salted water. Whilst this is going on heat up 150g butter, 100ml cream, 100ml milk in a saucepan gently. Drain potatoes and then return to hot, empty pan and cook off excess water. Mash them up a bit and then slowly start to add wet mixture whilst beating the potatoes good and proper. Finally just keep the mash on the heat and keep moving it around for 4 minutes until it is glossy and shiny, add salt and pepper to taste. Eat.