These biscuits are traditionally served with a glass of sweet wine or Madeira. Enjoy them with tea or coffee or try them with mulled wine when the weather is cold. They are particularly good eaten with poached fruits served in their syrup.
Half-fill a saucepan with water, bring it to the boil and remove from the heat. Meanwhile, put the sugar, egg, egg yolk, vanilla and lemon rind in a large bowl and place over the pan of steaming water. The base of the bowl should be just above the level of the water. Whisk with electric beaters for 5-10 minutes, or until