Prepare the cucumbers. Peel and slice it in half lengthwise. Scoop out the seeds using a spoon and place them on a chopping board sliced side down. Slice them thinly into half-moons.
In a small bowl, add the hot water, rice vinegar, sugar, and salt. Stir until the sugar and salt are dissolved. our over the cucumber, making sure to submerge as much cucumber as possible.
Prepare the zucchini. Slice the top and bottom parts. Cut them thinly lengthwise until you have 4 long slices. Stack them up and slice diagonally across until you have julienned cuts.