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Start with ingredients like distilled white vinegar, garlic powder, onion powder, salt, and MSG. It's worth noting that most restaurant and packet ranch dressings contain MSG, contributing to their flavor popularity. Combine the vinegar with salt, sugar, and MSG and stir until dissolved.
Using a mortar and pestle, grind up any coarse granulated garlic. In a mixing bowl, whisk together mayonnaise and sour cream. Gradually add buttermilk to create a creamy base, and then blend in your previously mixed spices along with finely chopped fresh herbs—such as chives, dill, and parsley—for freshness. A unique tip: let the ranch sit for 30 to 60 minutes in the fridge to allow the flavors to meld and thicken.