Ingredients

• 1 gallon carbonated water
• 2 1/2 cups sugar
• 2 teaspoons root beer concentrate
• 1 pound broken dry ice
• Vanilla ice cream, for serving

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Instructions

1. Combine the carbonated water, sugar and root beer concentrate in an extra-large bowl or punch bowl - something that is food-safe and won't break when the dry ice is added. Don't cover with a lid. Gently stir until the sugar is dissolved. Add the dry ice to the mixture in a well-ventilated area. The mixture will start to bubble. Let the mixture sit for 15 minutes to fully carbonate.
2. Ladle some of the root beer into a glass. Top with desired amount of vanilla ice cream.