If you love a classic Old Fashioned, this rich, butter-enhanced twist will be right up your alley. Fat-washing is a simple process that infuses liquor with all the alcohol-soluble flavors in fat. It's a great trick to fancify any not-so-great whiskey into something smooth and rich.

As a bonus, the butter becomes flavored with spicy notes of bourbon, perfect for your next batch of shortbread or for basting a pan-seared steak.

This recipe is for a batched drink, which transforms the whole bottle of whiskey into 12 cocktails, so guests can help themselves throughout the evening. Feel free to multiply the batch as needed.