Crempog (plural: crempogau) is a Welsh pancake made with flour, buttermilk, eggs, vinegar and salted butter. Traditionally made on bakestones or griddles, crempog is one of the oldest recipes in Wales. They are also known as ffroes, pancos and cramoth and are normally served piled into a stack and spread with butter. It is traditionally served at celebrations in Wales, such as Shrove Tuesday and birthdays.