Fake tuna fish

Preparation:

Preparation: Boil the potatoes and mash them in the potato masher. Add the tuna (finely crumbled and without oil), the anchovies (ditto) and the minced capers, the butter and half a tube of mayonnaise. Add a little salt, a spoonful of oil and put everything in a fish-shaped mould. Place in the refrigerator and before serving turn the mold upside down and garnish with the remaining mayonnaise. You can put an olive instead of eyes.