Put the berries with the gin in a bowl and leave to stand in the refrigerator for about 2 hours.
Cut 1/2 lemon into wafer-thin slices, squeeze out the other half. Also cut the lime into wafer-thin slices. Pluck the mint from the stem and put everything in a punch bowl, add the berries with gin and white wine and season with the elderflower syrup. You don`t need to add all of the syrup.
Tip: Halve the lemon and lime and cut with a cucumber slicer or bread machine.
To get the punch cold quickly, you can freeze the white wine in ice cube bags in advance and add the cubes instead of the bottle.