Peel off the peel from 8 lemons without the white inner skin. Do not peel 1 lemon and prick all around with a fork. Put the lemon peel and whole lemon with the alcohol in a sealed glass and let stand for a week at room temperature. Shake once a day.
After a week, sieve the peel off.
Mix the milk and sugar and heat a little until the sugar has dissolved and melted. Let it cool down again. Then mix with alcohol and vanilla sugar. Fill in bottles.