Simple but extremely attractive to deer. They can’t resist and come to it immediately. I always use strawberry flavoring. they are extremely attracted to it but don't eat a lot of it at one time so it lasts.
It makes it taste salty but also may have some nutrients in it. Molasses, pancake syrup. Apple jello, vanilla pudding. Couple boxes of salt. In addition to the sugar etc he's using. I heat mine on the stove and then let the corn soak into it. Some of the liquid I pour into a two liter bottle and pour into stumps and into the cracks on fallen trees.