Step 1

Place the onions in a small bowl of cold water. Let sit for ten minutes, then drain well and pat dry with a paper towel.

Step 2

In a large bowl, combine the drained red onions, cucumbers, cilantro, peanuts and jalapeño pepper. Set aside.

Step 3

Make the dressing: combine the lime juice, oil, fish sauce, sugar and garlic in a small bowl and whisk until the sugar dissolves. Pour the dressing over the salad and toss to combine. Taste and add salt if necessary. Serve the salad within 30 minutes.