There is absolutely no shortage of ways to toss together a totally refreshing cucumber salad. But the one I come back to again and again is made with crisp slices of cucumber tangled with sweet red onion and wisps of fresh dill, and blanketed with a rich and tangy dressing. It’s a summer staple that’s a breeze to pull together and partners with almost anything. Best of all, the cucumbers stay crispy for days.