In a small mixing bowl, whisk matcha, sugar, and gelatin.
Add hot water and mix well.
Add cold water and mix again.
Strain into a container that can hold 2-3 cups in volume. For cutting your jelly into cubes, I recommend a 6 inch square or 5x7 inch rectangular container.
Cover and allow to chill in the fridge for three hours.
When jelly is set, slice into cubes. Jelly can be served in small bowls (enough for four people) with condensed milk, red bean paste, or other sweet topping. It also works well as a bottom layer in matcha parfaits or as a drink with milk that can be slurped through a boba straw. Store leftovers in an airtight container in the fridge for up to three days.
I love my rectangular porcelain food storage containers that I got off Amazon. I use them to pack work lunches but also for chilling jellies that I want to cut into cubes. It's the perfect size. Unfortunately, my exact product is no longer sold, but I linked a similar one by the same brand in the equipment section at the top of this recipe card.