A simple, tangy cucumber and onion salad marinated in vinegar, perfect as a refreshing make-ahead side dish for barbecues and picnics.
Thin slicing is key to keep the salad crisp. Adjust sugar and vinegar to taste. Marinate for at least 1 hour for best flavor, but avoid more than 24 hours to prevent sogginess. Use a mandoline slicer for uniform slices if available. Salad keeps well for up to 3 days refrigerated.
Keywords: cucumber salad, onion salad, vinegar salad, make-ahead side, tangy salad, picnic salad, barbecue side dish, easy cucumber salad