1 ripe tomato, peeled and quartered
2 large avocados - peeled, pitted, and sliced
1 small onion, quartered
1 green bell pepper, chopped
1/4 cup fresh lemon juice
1 quart tomato juice
1 1/4 cups plain nonfat yogurt
salt to taste
1/4 cup chopped fresh chives
cayenne pepper to taste