Combine the sugar and water in a small saucepan over medium heat. Stir occasionally until the sugar completely dissolves and the mixture becomes clear, about 5 minutes. Do not let the syrup boil rapidly.

Remove the saucepan from heat and let the simple syrup cool to room temperature, approximately 15 to 20 minutes. You can speed this process by transferring the syrup to a heat-safe bowl and placing it in the refrigerator for 10 minutes.

Place one vanilla bean on a cutting board and use a sharp paring knife to slice it lengthwise from top to bottom. Open the bean like a book and use the back of your knife or a small spoon to scrape out all the tiny seeds inside. Collect both the seeds and the scraped pods. Repeat this process with all six vanilla beans.

Use kitchen scissors or your paring knife to cut the scraped vanilla bean pods into small pieces, about 1/4 inch long.

Add the vanilla seeds, chopped pods, and cooled simple syrup to your food processor or high-speed blender. If using alcohol, add it now.

Blend on high speed for 2 to 3 minutes, stopping to scrape down the sides as needed. The mixture should become thick and dark with visible flecks, resembling wet coffee grounds.

Keep blending for an additional 1 to 2 minutes until the pod pieces become very fine and the paste reaches a uniform consistency. The texture should resemble smooth peanut butter with visible vanilla bean specks throughout.

For an ultra-smooth paste without any larger pod pieces, pour the mixture through a fine-mesh strainer into a bowl. Use the back of a spoon to press the paste through, extracting maximum flavor while removing fibrous bits. This step is optional.

Transfer the finished vanilla bean paste to a sterilized glass jar with an airtight lid. Press down gently to remove any air pockets, and wipe the rim clean before sealing. Store the jar in a cool, dark place like your pantry, away from direct heat or sunlight.