Add salt to the cucumber, mix well and set aside in the fridge for 10-15 minutes. In the meantime, make the dressing, by combining all the ingredients in a small sauce pan.
Turn on the heat and reduce the dressing a bit, so it's slightly thickened. Let cool.
Drain the salt water from the cucumber completely. Toss the cucumber, onion, and mix with the Dressing. Top with the peanut and cilantro, serve immediately.
