Thread jute twine in each of the bubble mold hole, tie a knot inside the mold, leaving about 20 inches long for each thread;

To make the purple "grape", dissolve the jelly powder in the water off heat first, stir to mix well, then cook over medium heat while continue to stir vigorously, until it's brought to a boil, about 8 minutes;

Add grape juice and sweetener, stir, and pour into the mold, cover with the lid, push down to make sure each bubble is filled, make sure not to get the twines twisted, let it cool down before transfer to the fridge;

To make the green "grape", repeat the same steps with the water and jelly powder;

Meanwhile, whisk the matcha powder with hot water until smooth and fully dissolved, add the matcha to the jelly mixture, and pour into the mold, close the lid, let it cool down before transfer to the fridge;

Let them set in the fridge for at least 3 hours, or overnight;

When ready to serve, pop each bubble out of the mold, carefully. pull out the twine, start twisting two of them together, then add more with various height by twisting each twine onto the previous ones, arrange them to look like a bunch of grapes;

Serve chilled, enjoy!