Instructions:
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Slice the Onion: Peel the red onion and slice it into very thin half-moons. This ensures its flavor isn’t too overpowering in each bite. Add it to the bowl.
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Make the Dressing: In a small bowl or a jar with a lid, whisk together the olive oil, red wine vinegar, salt, pepper, and oregano (if using). Whisk until the mixture is well combined and slightly emulsified.
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Combine and Toss: Pour the dressing over the vegetables in the large bowl. Gently toss everything together until the tomatoes, cucumber, and onion are evenly coated with the dressing.
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Rest and Serve: For the best flavor, let the salad sit for about 10-15 minutes before serving. This allows the flavors to meld together and the onions to slightly soften. Garnish with fresh herbs just before serving.