I found a recipe on cooks.com and tried it. It had a flavor very close to the name brand stuff in the store, but I thought it was a bit too thin.The second time I made it, I had to substitute rice vinegar for the cider vinegar and I messed around with it until it was to my liking. I think I prefer it with rice vinegar, although if you don't like rice vinegar you might not like this dressing made with it. Use cider vinegar (1/4 cup) instead. Xanthan gum is an emulsifier and is derived from corn so people with corn allergies probably can't have it. But, it gives it that "store bought" consistency and does not affect the flavor. Xanthan gum can usually be found in supermarkets, either in the "gluten free" section or baking aisle. Bob's Red Mill makes it. Co-ops and natural foods stores should carry it as well.