Thai Cucumber Salad with Peanuts

Name: Thai Cucumber Salad with Peanuts
Cook time: 20 min
Total time: 20 min
Cuisine: Asian, Thai
Ingredients: ½ medium red onion, very thinly sliced; 2 large English cucumbers, halved lengthwise, seeded and sliced crosswise ¼-inch thick; ⅓ cup packed chopped fresh cilantro; ½ cup salted peanuts; 1 large jalapeño pepper, seeded and minced (or use 1-2 Thai chiles for more heat); ¼ teaspoon salt (optional); ¼ cup fresh lime juice, from 2-3 limes; 2 tablespoons vegetable oil; 1½ tablespoons fish sauce; 2 tablespoons sugar; 1 garlic clove, minced