Mix 1 tablespoon of granulated sugar with 1/2 tablespoon of boiling hot water. Mix just until the sugar dissolves.
Now, combine the 1 cup mayonnaise, 1/4 cup barbecue sauce (sweet baby rays brand), 1 1/2 tablespoons yellow mustard, and 1/4 teaspoon liquid smoke and mix. Make sure to use a whisk or spatula to scrape all the sides really well.
Storing and shelf lifeTo keep this homemade Chick-fil-a sauce fresh, store it in an airtight container in the refrigerator. It will keep for about 2 weeks.