Cool and refreshing...again, tomatoes welcome as an addition.
4 cups diced cucumbers (peeled if desired)
1/4 cup finely chopped red onion
1/4 cup chopped sweet basil (or more if desired)
1 Tbsp red wine vinegar
1 Tbsp olive oil, preferably a nice fruity one
Salt to taste
Toss all ingredients in a bowl. Refrigerate until ready to serve.