New Year's Eve cocktail: Aperol Grapefruit

For 4 glasses:

4 limes
100ml aperol
4 tbsp. brown sugar (or some more, if you like it sweeter)
650ml grapefruit juice (fresh one, if you have time)
ice cubes

1. Store all fluids in the fridge before use.
2. Squash the limes (maybe keep some for decoration).
3. Mix lime juice with aperol, brown sugar and grapefruit juice.
4. Put the ince cubes into the glasses and pour the drin on top.