Ingredients:

• 2 egg yolks
• 100g caster sugar
• 100g butter or margarine
• juice of 1 lime or lemon

Method

1. Cream the egg yolks and sugar in a bowl with a whisk.
2. Add the butter and juice of lime.
3. Place in a bain-marie on a low heat and whisk continuously until it thickens. This can take up to 30 minutes.