1. Bring the water to a boil. Add the coffee and sugar. Continue stirring to dissolve all sugar.
2. Let the mixture cool and add the vanilla and vodka. Stir mixture and strain into a bottle. Do not add the vodka to a hot mixture or allow the mixture to sit in the open air. Alcohol has a lower boiling point then water.
3. The yield of this recipe is 1.5 liters. The alcohol content is around 26.7%. This number is easy to calculate. We know if vodka is 40% ethanol, then the vodka contains 0.4 liters of ethanol. We measure the final product in liters. Then we divide 0.4 by 1.5 in my recipe which yields 0.267 ethanol (or 26.7% ethanol).
4. I reduced the sugar in my diet, so this recipe uses half the sugar in regular recipes. You can adjust the sweetness by adding a sugar syrup.
5. Enjoy over the rocks or add one part liqueur and one part milk to a glass of ice.
Tip: Kahlua is about 20% ethanol, so my recipe is a tad stronger.
Tip: You can adjust the sweetness by making a sugar syrup. Just boil one cup of water with one cup of sugar. You simmer the mixture while continually stirring. Once the sugar dissolves, then let the syrup cool.