Chop and Slice: Start by chopping the tomatoes into bite-sized pieces, slice the cucumber thinly, and finely slice the red onion. Place them in a mixing bowl.
Combine Ingredients: Drizzle the olive oil and vinegar (or lemon juice) over the chopped vegetables.
Season: Add salt, pepper, and optionally sprinkle some dried oregano or mint for added flavor.
Mix Well: Toss gently until all the ingredients are well combined.
Chill: For the best flavor, let the salad sit in the refrigerator for about 30 minutes.
Serve: Enjoy it chilled, either on its own or as a side dish!