1 1/2 tablespoons lemon juice
2 cloves garlic, minced
1/2 teaspoon thyme
1/4 teaspoon salt
1/4 teaspoon pepper
1/8 teaspoon cayenne pepper
1/2 cup nonfat plain yogurt
3 cups cubed, cooked chicken
1 cup thinly sliced green onion
1/2 cup diced green bell pepper
1/2 cup diced celery
3 cups (about 1 1/2 pounds) seeded and diced fresh tomatoes