(*) Mix basil juice with sugar and juice of one lemon and make until jelly test (see below).
Add the basil leaves. Make again 2 min. Make the jelly test! Empty into hot rinsed jars. Rinse the jar lids with rum. Close the jars on the spot.
Cool upside down.
To test for gelatinization, place 1 small plate in the refrigerator. Put a drop of the preserves on such a cold plate and hold it diagonally. If the drop remains solid, the jam can be skimmed and poured on the spot. Skimming is best done with a large spoon. Jam foam can be used as a yogurt additive or as a spread to be consumed soon.
Suggested dessert: vanilla ice cream with basil jelly.