1. preheat the electric oven to 150 degrees.
Squeeze the juice of one orange and the lemons. 3.
Using a whisk, beat the eggs, egg yolks with double cream, mace, vanilla sugar, sugar, alcohol, orange juice and juice of one lemon until creamy. Pour the cream into a medium-high ovenproof container or saucepan, cover with aluminum foil and bake in a heated oven at 150 °C with the door open for 35 to 40 minutes (gas mark 1).
4. mix the cream with a whisk, then fill it into wide champagne flutes (perhaps decorate them with a sugar rim beforehand), cool a little. Garnish with a slice of lemon and serve while still warm.