Bring 250 ml water with sugar to the boil and remove from the stove
Wash mint, shake dry, pluck off leaves. Put 4-5 leaves aside. Put the rest of the mint into the pot, cover and let it cool down
Pour mint syrup through a sieve, mix with lemon juice and rum. Pour into a flat container and freeze for 3-4 hours, stirring every 30 minutes with a fork at the beginning
Cut the remaining mint into strips. Fill frozen mojito into glasses, decorate with pineapple and mint strips
waiting time approx. 3 1/2 hours