Summer Salad

Yesterday was such a lovely day . . . the first day in the 80's since last year. We spent almost the entire day outside.
I HAD to make this delicious summer tomato salad to celebrate the sun!

tomatoes (any variety your palate loves)
red onion
english cucumber (seedless)
vinegar (any flavor)
olive oil
sea salt
pepper
parsley (flakes are fine)