Okay, so it isn't in Springfield but Marshfield has this food truck that has the best burgers I have ever had. This is going to sound like a joke, but its called Tokyo Hibachi Express, and recently they split the business from a lone food truck to a food truck and a dine in location. You want the food truck. I know you wouldn't expect a Japanese food truck to have the best burger, but I also don't buy burgers anywhere else.