There are different types of love that can be sweetened between two people, so alterations could be added. Honey is also great for healing. Sweetening can also be about making one's mood better, a little happier.
Honey Jars are just one of the simplest works to do in hoodoo. Jar spells in general are really simple to make and are meant for the long run, so one could make a jar spell every month or so and keep the spell going as a daily practice.