"This simple salad was such a hit at a dinner party I decided to share the recipe. The secret is the red onion which really makes the other flavors pop. A little onion goes a long way. For a different twist, substitute 1 mango for the 2 tomatoes."
Combine all ingredients except vinagrette in a large salad bowl. Toss with vinagrette right before serving, or have guests do their own. I like a lightly dressed salad, and the fat in the seeds and avocado decrease the need for dressing in my opinion, but have extra dressing on hand per your taste. If you want to save some for leftovers, leave sunflower seeds out until serving as well.