Soaking the onions in water smooths out all their rough edges. Prep Time: 10 minutes. Notes: You can make this salad up to 1 day ahead.
Put onions in a bowl of cold water and soak for 5 minutes. Drain.
In large bowl, toss tomatoes with onions, hearts of palm, parsley, lime juice, salt, and pepper.
Note: Nutritional analysis is per serving.