Elderflower Hollandaise

• 3 teaspoons elderflower vinegar
• 1 tablespoon water
• 1

Place 3 tablespoons of vinegar, the water, mace and peppercorns in a saucepan and boil to reduce to 1 tablespoon. Put the egg yolks in a bowl set over a pan of simmering water and beat them with a teaspo