This low-calorie, tasty salad has no lettuce, but you can add some if you like. You can serve this at a party or picnic or take it in your lunch sack in a to-go container.
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Cut the tomatoes in half. Peel the cucumber, then slice into long quarters and remove the seeds. Cut into large dice. Chop the olives in quarters. Mix the tomatoes, cucumber, and olives in a large bowl. Drizzle with the lemon juice and olive oil. Sprinkle with the oregano. Add the feta cheese. Toss lightly. Let stand at room temperature for ½ hour to let the flavors marinate before serving.