Step 1

In a small bowl, mix together the red wine vinegar (2 tablespoons), sugar (1 teaspoon), kosher salt (1/2 teaspoon), and black pepper (1/4 teaspoon). Add the sliced red onions and stir to coat. Allow to sit for 5-10 minutes, stirring once or twice.

Step 2

While you let the onions sit: cut the ends off the cucumber, slice in half lengthwise, and scoop out the seeds with a spoon. Discard the seeds and slice the cucumber thinly, about 1/4" thick. Add to a large bowl. (And if you prefer, you can peel the cucumber before cutting it.)

Step 3

Cut the cherry tomatoes in half and add to the large bowl as well.

Step 4

If your feta cheese isn't already crumbled, use a fork to crumble it and add it to the large bowl.

Step 5

Drizzle the olive oil (1/4 cup) into the small bowl with the onions, add the chopped fresh parsley (2 tablespoons) or other herbs, and mix together.

Step 6

Pour the onion mixture into the large bowl with the remaining ingredients and toss to coat. Serve immediately for best results.