Remove the grapes from the stem, rinse and drain them.
Put them in a bowl, pour over the lemon juice, (reserve 1-2 tablespoons for later use) and mix gently. Cover the bowl with a kitchen towel and let them stand for about 2 hours to allow the grapes to stiffen.
Put in a pot the water and sugar and boil for about 7-8 minutes, until the sugar melts.
Drain the grapes from the lemon juice, add them to the pot and continue boiling for another 10-15 minutes, over high heat or until syrup thickens.
Add the reserved lemon juice and boil for about 30 seconds. This will help the syrup from crystallizing over time. Remove from heat and let the preserve cool down thoroughly overnight.
We place the grape preserve into sterilized airtight glass jars and keep in the fridge.
We can serve the "gliko tou koutaliou stafili", accompanied with yogurt.