Bread and Butter Custard

4 slices day old bread
butter
1 teaspoon grated lemon rind
500ml milk
ground nutmeg
1 tablespoon sultanas
3 eggs
2 tablespoon sugar
1/2 teaspoon vanilla

Beat eggs with sugar, add lemon rind, milk, and essence. Pour into dish, stir in sultanas. Remove crusts from bread, butter each slice