@thegrilldads: Wisco Butter Burgers Since 1936, Solly’s Grille has been family owned and operated. In that time, a truly iconic American food has taken hold, The Butter Burger. An incredible addition to Wisconsin food culture that utilizes one of its proudest products: Butter..a lot of butter. To be frank, this burger is fantastic and also has epic stewed onions ladled on top but that butter amps up everything to another level. Just when you think its all melted away, you go for another dip on the plate. Its almost cheating to be fair, but its also the best burger concept ever.