Heirloom Tomato and Avocado Stack

Dressing:

1/3 cup low-fat buttermilk

1/4 cup chopped fresh cilantro

2 tablespoons reduced-fat sour cream

1 tablespoon reduced-fad mayonnaise

1/2 teaspoon grated lime rind

1/4 teaspoon minced fresh garlic

1/4 teaspoon salt

1/8 teaspoon ground cumin

Dash of ground red pepper

To prepare dressing, combine first 9 ingredients in a small food processor or blender; process 30 seconds or until pureed, scraping sides of bowl occasionally. Cover and chill.

Salad:

4 medium heirloom tomatoes (about 2 pounds)

1/4 teaspoon salt

1/4 cup very thinly vertically sliced red onion

1 cup diced peeled avocado (about 1 small)

Coarsley ground black pepper (optional)

To prepare salad, slice each tomoato crosswise into 4 equal slices (about 1/2 inch thick). Place 1 tomato slice on each of 4 salad plates; sprinkle slices evenly with 1/4 teaspoon salt. Top each serving with a few onion pieces and about 1 tablespoon avocado. Repeat layers 3 times, ending with avocado. Drizzle 2 tablespoons dressing over each serving; sprinkle with black pepper, if desired.

Yield: 4 servings