Wash 500 g Japanese cucumber and cut off the ends.
Cut the cucumber into rough bite-size chunks 1 to 2 cm (½ to ¾ inch) thick, with some skin on every piece.
Place into a large zip lock bag and add 50 g sugar, 15 g salt and 1½ tbsp wasabi paste.
Rub the ingredients all over the cucumber, try and make sure all of the pieces are covered. You can do this from the outside of the zip lock bag, there's no need to get your hands dirty.
Once evenly coated, seal the bag and leave in the fridge for 12 hours. I recommend placing the bag in a container to prevent leaks.
Use clean chopsticks or tongs to remove the pieces from the brine. Serve and enjoy!
Notes
Store in a sealed container in the fridge and consume within 2-3 days. These are quick pickles that require refrigeration and spoil a lot faster than fermented pickles.Keep the full sugar the first time: Along with the salt, the sugar is what draws the water out of the cucumber. Use less and the pickle stays watery and tastes of raw wasabi heat. Adjust the sweetness on your second batch.Weigh the salt: Measure precisely on a scale, avoid rough spoonfuls. The same spoonful of kosher salt can weigh nearly twice as much from one brand to another, and that difference shows up directly in how salty the pickle tastes.Dry it before it goes in the bag: Water left on the skin waters down the sugar, salt and wasabi in the bag.Keep the skin on and cut thick: The skin and a 1 to 2 cm thickness are what hold on to the green color and the crunch after pickling. Thin slices go limp as the water leaves.Turn the bag once partway through: A bag that never moves keeps its liquid at the bottom, and the upper pieces come out underseasoned. Next time the fridge is open, flip it over and massage it briefly.A green liquid is no sign of spoilage: It is only the color of the wasabi moving into the liquid. Drain it off and the flavor stays in the cucumber.