This is really easy!
2 cups Bourbon
2 tablespoons bacon grease
In a glass jar, combine the bourbon and the bacon grease. Stir well and let sit at room temperature for 6-8 hours. Place in refrigerator for at least one day. Remove from refrigerator. Remove solid grease from jar and discard. With a fine mesh sieve, strain out solids from bourbon. If necessary, strain a second time using cheese cloth to get all small solids out.
Use bacon infused bourbon in many bourbon based cocktails. Check out the cocktails section on Oinkcooking for recipes!