1 tomato, quartered
1/4 to 1/3 cup olive oil
1 heaping Tbls. mayonnaise (non-sugar is best)
1 large clove garlic, crushed
salt to taste
1 juice of one lemon or lime or 1/4 cup balsamic vinegar
fresh herbs like parsley, cilantro, etc.

Add all the above to a blender. Blend well. Keep refrigerated until ready to use.