Try making a jam by boiling them with a bit of honey and herbs and some natural beef gelatin.
-Place the grapes in a pot, fill with enough water to stop them sticking.
-Boil them, stir continually. Keep a glass on hand so you can just pour a bit more water in if it runs low.
-When they're breaking down and sticky, add a teaspoonful to four teaspoonfuls of honey and any herbs you want to use (rosemary or mint would be nice, in my opinion).
-Continue stirring until the smells are mixed.
-Add some natural beef gelatine. You'll probably need 1 teaspoonful of powdered gelatin per 200/250g of fruit. So try with 4 teaspoonfuls. If it doesn't set well, you can always boil it up and ADD gelatin, but you can't remove it from the mix, so it's better to use too little than too much!
-Stir everyithing in until it's a sticky mix.
-Pour into jars and cover them with a cloth. Leave them on the side until cool.
-Place in fridge to set faster. Once set, screw the lid on your jar.
-Tadaa! Grape jam.