How to make Hollandaise sauce

Serves: 4

Ingredients

4 essential Waitrose egg yolks

250ml melted unsalted butter

50ml white wine vinegar

Juice of half a lemon

Salt and pepper

Method

1. Reduce the vinegar and lemon juice by ¾’s

2. Add two tablespoons of the mixture to the egg yolks and whisk over a bain marie until thick and it has trebled in volume. 

3. Whisk in the melted butter till all incorporated. Season to taste.