This is one of my favorite lunches and something I have pretty often! It's super quick to toss together and is definitely one of those "more than the sum of its parts" concoctions. The crunchy, mild cucumbers, sweet, acidic tomatoes, super salty and slightly bitter olives, tangy, salty, creamy feta, and pucker of vinegar are just perfect together. You don't even need any oil, though a splash of olive oil wouldn't hurt anything. I'm not sure it actually qualifies as a recipe, but who cares? The amounts for all these ingredients are completely up to you.
Speedy Greek Salad
cucumber, cut into small bite sized pieces
halved cherry tomatoes (or big tomatoes cut into bite sized pieces)
pitted kalamata olives
salt to taste
small sprinkle of oregano (sometimes I add it, sometimes I don't)
a splash or two of raw apple cider vinegar or red wine vinegar
Consider how many people you'll be serving and whether this will be the main dish or a side. Put however much cucumber and tomatoes you want into an appropriately sized bowl and sprinkle with salt, toss. Add however many olives and how much feta you want. Sprinkle with the optional oregano then drizzle on a little vinegar. Toss to combine. Taste and add more of anything.