If your cucumbers are large and seedy, scoop out the seeds before blending to keep the soup from turning watery. Half a blended avocado makes it extra creamy. Use coconut yogurt for a dairy-free version, and reach for lime juice or a splash of vinegar if you're out of lemon. If the cucumbers taste slightly bitter, a spoonful of honey balances them. Don't skip the chill—at least an hour deepens the flavor and cools the soup beautifully. It keeps in the fridge for up to 24 hours.