Rinse the sloe berries and use a fork to prick each one, creating small holes in the skins. This will help the gin better penetrate the berries during the infusion process.

In a clean, sterilized jar or bottle, combine the pricked sloe berries and the gin. Seal the container and store it in a cool, dark place for 2-3 months, shaking occasionally.

After the initial infusion period, strain the mixture through a fine-mesh sieve or cheesecloth to remove the solids.

Add the granulated sugar to the strained gin and stir until fully dissolved. Taste and add more sugar if desired, to balance the tartness of the sloe berries.

Transfer the sweetened sloe gin to clean, sterilized bottles. Allow the liqueur to age for an additional 3-6 months, during which time the flavors will continue to meld and develop.

Once the aging process is complete, your homemade sloe gin is ready to enjoy! Serve it neat, over ice, or use it as the base for a variety of classic cocktails.