Aunt Meredith's Root Beer

1 lb. (~2.2cups) sugar
Water to make 1 gallon
4 t. root beer extract
1 1/2 lbs. dry ice

Put sugar in deep container w loose lid. Add enough water to make 1 gallon. Stir to dissolve. Add extract and stir. Add dry ice and cover loosely.  Let sit until carbonated, about 30-45 minutes.

I usually end up using a little more sugar and at least 50% more extract. Stir and taste as you adjust. It should be a little too sweet because once it's carbonated it cuts the sweetness a bit.   We make 3 gallons at a time for our BBQs and use about 7-10 lbs dry ice for that much.

Do not put it into a sealed container while it has dry ice in it. It can explode.

For extract, ice used McCormick, Hire's and one other odd brand that I can't remember. It's pretty much a case of using what you can find. If you can't find any out there, I'll keep an eye out and see what I can find. Extract is usually on the baking aisle with other extracts.