A & W®
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Sure, Roy Allen and Frank Wright are better known for the exquisite root beer concoction sold first from California drive-up stands under the A & amp;W brand name. But these days the company makes a darn good vanilla cream soda as well. And the formula is one we can easily clone at home by combining a few simple ingredients. Most of the flavor comes from vanilla, but you'll also need a little lemonade flavor Kool-Aid unsweetened drink mix powder. This mix comes in .23-ounce packets and provides the essential citric acid that gives this A&W cream soda copycat recipe the slight sour flavor of the real thing. Once you make the syrup, let it cool down in the fridge, then combine the syrup with cold soda water in a 1-to-4 ration, add a little ice, and get sipping.
Source: Top Secret Recipes: Sodas, Smoothies, Spirits and Shakes by Todd Wilbur.