Mash 100g of soft unsalted butter with a fork. Sprinkle over 1 teaspoon of sea salt, then finely grate over two strokes of lemon and clementine zest. Finely chop ¼ of a fresh red chilli, pick in the leaves from a few sprigs of thyme, and mash everything together (you can blitz it all in a food processor or pound in a pestle and mortar, if you like).
Jamie's Cook-Ahead Christmas
By Jamie Oliver