Tummy-friendly Homemade Buttermilk Ranch Dressing: GP adaptation - sub Greek yogurt for sour cream, use lower fat mayo. I used coconut milk (no flavor) with a tsp of vinegar. I added a bit of dill & finely chopped shallots. It doesn't taste exactly like Hidden Valley, but a 7 & 12 year old fully endorsed it & drank shots of it! No one knew it was lower-fat. The fresh herb taste is amazing!