Melted Butter

• 100 g (3½ oz) very fresh unsalted butter, cut in pieces
• salt
• juice of

Bring 5 tablespoons of water to the boil in a small saucepan, together with a pinch of salt. Add half the butter, in pieces, and allow to come to a galloping boil. Remove from the heat and gradually whisk in the rest of the butter, a few pieces at a time. If you like, the juice of half a lemon can b