Push the straw into the end where the grape was removed from the bunch.
Pierce it straight through to the other side by slightly twisting the straw.
Leaving the straw inserted, peel the skin from the bottom of the grape to the stem side.
The seed is stuck inside the straw, so you'll be able to remove it easily.
Story Behind this Recipe
I don't want to take the time to peel and de-seed grapes.
If the seed gets inadvertently left in the grape, scratch it out with a straw. If the straw is too long, the seed will get stuck in it and won't shoot out like a rocket, so cutting it down to 15 cm is the most convenient.