This Cucumber Onion Salad is a simple salad mixing together crisp cucumbers, thinly sliced red onion and tossed in a light tangy dressing with fresh dill. It makes a great side dish to bring to a get together, bbq or picnic. It pairs nicely with grilled meats and seafood! This Cucumber Onion Salad is a simple salad mixing together crisp cucumbers, thinly sliced red onion and tossed in a light tangy dressing with fresh dill. It makes a great side dish to bring to a get together, bbq or picnic. It pairs nicely with grilled meats and seafood!