Heat up the champagne with the juice and zest
Soak the gelatin in cold water
Whisk the egg yolks with the sugar until pale and thick
Pour the warm champagne over the eggs and mix well
Cooked at low temperature (gas stove) or medium heat (electrical stove) until the temperature reaches about 85?C or 185?F (? la nappe cooking)
Combine the drained gelatin
Mix
Leave it to cool, stirring from time to time
Whip up the cold whipping cream
Combine the whipped cream with the cold mixture
Mold
Keep refrigerated