1Peel the cucumbers, then slice them in half lengthwise. Using a teaspoon, scrape down the center of each half to remove any seeds. Slice the cucumber halves crosswise into thin slices. A mandoline is best, but a knife is fine. Trim the jalapeno, slice in half lengthwise, then remove the seeds before mincing.
2In a large bowl, combine the jalapeno, shallots, soy sauce, fish sauce, lime juice and sugar, then stir to combine. Add the cucumbers and toss to combine. Taste and adjust if necessary.
3Transfer the mixture to a serving bowl or platter, then top with the cilantro/fresh herbs, peanuts and a garnish of lime zest.