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I cut the sugar in grandma's limoncello by 30% and still end up with rocket fuel syrup which my friends think will cause sleep problems and diabeetus

The yeast eats the sugar and turns it into alcohol. More sugar more alcohol, grandma’s version sounds good.

Alcohol concentrations over 20% kill yeast, so adding sugar to distilled spirits will not create more alcohol.

Ahh, yes I forgot it’s not fermented you just use vodka or something stronger with the lemon peels.