Toss the cucumbers with the salt in a colander, and leave in the sink to drain for 30 minutes. Rinse with cold water, then drain and pat dry with paper towels.
Whisk together the sugar and vinegar in a mixing bowl until the sugar has dissolved. Add the cucumbers, jalapeno peppers, and cilantro; toss to combine. Sprinkle chopped peanuts on top before serving.
