Notes: You can complete step 1 up to 1 hour before serving; cover and let stand at room temperature or chill. Prep time: about 20 minutes.
Rinse and core tomatoes; cut into 1/2-inch-thick wedges. Peel and sliver onion. In a colander, rinse and drain onion. Combine tomatoes, onion, and parsley in a large bowl.
Just before serving, add olive oil, lemon juice, cumin, and pepper; mix gently, adding salt to taste.
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