2 ounces (55g) red onion (1/4 medium 8-ounce onion), thinly sliced pole to pole
1/4 cup (60ml) red wine vinegar
12 ounces (340g) mixed ripe tomatoes, cut into slices and chunks (about 2 heaping cups when cut up)
12 ounces cucumber (340g; about 2 small cucumbers), peeled (or partially peeled or unpeeled, if you want some of the bitter skin); quartered lengthwise; and thinly sliced crosswise
1/4 cup pitted Kalamata or other briny black olives (about 1 1/2 ounces; 40g), see note
1/2 cup (120ml) extra-virgin olive oil, plus more for drizzling
Kosher or sea salt
2 big pinches dried Greek or Mediterranean oregano, divided
4 ounces (115g) feta cheese, preferably cut into slabs
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