From HGTV: Chef Cary Neff shares a recipe for a homemade, fat-free mayonnaise that will add flavor but not calories to any dish. This has 15 calories per tablespoon, compared with 229 calories for traditional mayonnaise.
Make yogurt cheese by draining the yogurt as follows. Line a colander with cheesecloth and place in a bowl. Spoon the yogurt into the colander. Refrigerate and let drain for at least 1 hour. Discard the liquid in the bowl.
In a food processor, combine the yogurt cheese, tofu, and garlic. Process until the mixture is pureed, about 3 minutes.
Add the remaining ingredients. Process again to combine, about 3 minutes. Adjust the seasoning with additional salt or pepper, to taste.
This dressing will keep for up to 2 weeks in an airtight container in the refrigerator.