Make your own root beer extract?

Ingredients for 5 gallons (19 L):
3 quarts (2.9 L) brown molasses
2 oz. (57 g) sassafras bark (US government regards sassafras as a
carcinogen.)
2 oz. (57 g) sarsaparilla (woody, shredded)
2 oz. (57 g) wintergreen (herb)
1/2 oz. (14.2 g) licorice bark of root (woody, shredded)
1 vanilla bean (chopped)
up to 1 lb. (0.45 kg) honey, corn or cane sugar to taste
Optional flavorings: teaberry, dearberry, checkerberry, boxberry,
spiceberry, clove, cinnamon, star anise, ginger, ginseng, juniper berries,
and malt extract.

Bring two gallons of water to a boil. Add the ingredients, without any honey or sugar, stir, and immediately turn off the heat. Cover and allow to steep for 2 to 4 hours. Strain the mixture and add cold water to a total volume of 5 gallons. Add honey and sugar to taste. Chill. Force carbonate with carbon dioxide in a soda siphon bottle or carbonate with pieces of dry ice. If stored for a long time, check the pressure to avoid possible explosions.

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