Try this Homemade Kahlua recipe, or contribute your own.
Can this enormous batch be halved if storage space is tight? Scaling the volume down requires simple arithmetic, but the solvent properties of ethanol demand careful attention to sugar saturation. Water and sugar ratios must scale uniformly to prevent the sucrose from precipitating out of solution during the resting phase. Granulated white sugar dissolves cleanly in hot water up to a high saturation point, yet altering the ethanol ratio changes the final density.
Instant coffee granules provide the bitter roast notes without introducing unwanted sediment. Pure vanilla extract adds aromatic compounds that bind slowly with alcohol molecules over time. Pour the vodka in a steady stream only after the sugar syrup cools slightly to prevent volatilizing the alcohol. Let the mixture rest for one hour before bottling in sterilized glass containers. Store the bottles in a cool, dark pantry for thirty to forty-five days to allow the harsh edges of the high-proof spirit to mellow completely.