MN guy here. No barrels or honey burns allowed in MN. As previously mentioned, beaver carcasses, fryer grease, and day old doughnuts from a bakery. But BY FAR, the best I have seen used is either licorice remnants from a candy manufacturer or sweetened cereal in bulk from a manufacturer. Another thing we used to use years ago was a product called "hog starter" which was a powdered product that hog farmers would sprinkle on food for baby pigs. It smelled fairly sweet and really seemed to work. Also have seen guys mix up grape Koolaid, the kind with sugar added. Put it in a spray bottle and spray it over everything at the bait site. For some reason around areas I've hunted in MN, they seem to respond better to "sweet", except beaver carcasses, that trumps everything else. Keep those carcasses in sealed 55 gallon drums through the summer. Then reach down in there and try to pull one out whole, and put it in a gunny sack and hang that way up in a tree. Really gets that awesome smell distributed around the whole area. Had a buddy that was so sensitive to that smell he would have to smear Vicks around his nose or he would start vomiting immediately upon smelling the rotting beaver carcasses.