Hands on Time
Make Tzatziki: Mix all the ingredients together in a medium bowl, taste and adjust seasonings. Either serve immediately or store for up to three days in the refrigerator.
Make the salad: Cut the tomatoes (or don’t, if you want to save some time) and put them into a bowl with the sliced onion. Add the olive oil, vinegar, parsley, and salt and pepper to taste. Stir and let sit for 5-10 minutes so that the flavors can meld. Crumble feta on top just before serving.