Juice. One large pomegranate will yield on cup of pomegranate juice. Peel pomegranate and collect the seeds. Place into a blender and blend. Strain juice into a separate container. You can also purchase pomegranate juice with no additives, such as POM.
Combine. Combine the sugar and juice in a sauce pan. Place over medium heat on the stovetop. Stir to dissolve sugar.
Boil. Bring the mixture to a boil and cook for 5 minutes or until slightly thickened. Careful, the mixture will bubble over the pan if you aren’t watching it.
Cool. Remove from heat and cool. Taste and squeeze a few drops of lemon juice to bring out the flavors.
Bottle. Pour the syrup into a jar or bottle and label with the date. Store in the refrigerator for up to one month. Adding vodka to the mixture acts a preservative. Your grenadine should keep for two months.