Making your own is very easy.

Ingredients

  • 2 tblsp white wine vinegar
  • 225g (8oz) unsalted butter, diced and chilled
  • 3 egg yolks
  • Sea salt and freshly ground black pepper

Method

  1. Place the white wine vinegar in a small pan with 1 tablespoon water and reduce to 1 tablespoon. Leave to cool.
  2. Melt the butter in a small pan or in a dish in the microwave. Set aside and keep warm.
  3. Beat 2 tablespoons water into the egg yolks, then beat into the reduced vinegar mixture. Stir with a whisk over a low heat until smooth and velvety, beating continuously.
  4. Add the melted butter to the egg yolk mixture, little by little, until you have achieved a thick, smooth sauce. If it becomes too thick, add 1 tablespoon warm water. Season to taste and keep warm but not hot or the sauce will split.