Add the juice of 1 lime and 1 tablespoon pear eau-de-vie if desired, mix again thoroughly, and frigerate until dessert time.
Serve cool, garnished with a mint leaf.
Remarks
Pears turn brown very fast once peeled, so to prevent this I sugest you prepare one pear at a time, I mean: peel a pear, remove core, cut in pieces and mix in the bowl with the others. Then they oly be exposed to the air for the minimum timw after peeling.
Another possibility is to add some vitamin C to your syrup.
Anyhow, this recipe is a delicate preparation which doesn't keep, and must stay in the fridge protected from air by plastic film.