Dissolve the gelatin powder in cold water.
Heat the orange juice until 60 ° C and add the eggs, yolks and sugar.
Heat further until 85 ° C and then melt the gelatin mass in it.
Mix it all and leave cool to 35 ° C.
Melt the butter in the mixture and add the limoncello last.
Keep the crémeux in the refrigerator, in a closed recipient.
Smooth the crémeux just before use.
Transfer to a piping bag.