Wash the grapes and remove the stem
Bring the water and the sugar to a boil in a pot and let it boil while stirring till the sugar has dissolved
Add the grapes and let it boil for another 10 min
Turn off the heat and cover the pot with a dishtowel and let the mixture rest for about 24 hours till the grapes have become wrinkly like raisins
Add the lemon juice, cinnamon, and vanilla
Turn the heat back on and let the mixture simmer/lightly boil till it starts to thicken (about 1 hour). Take a sample using a spoon once in a while. Let the sample cool in order to determined how thick it has become. The mixture is ready when it becomes a viscous syrup
Remove the cinnamon sticks and transfer at once the syrup to the jar and close it. Turn opside down for a few minuts