Burger, burger on the wall, who is the tastiest of them all? If you want your mind truly blown, order the Big Mack at Nosh Kitchen Bar, which includes lettuce, special sauce, American cheese, pickles, onions, and a triple stack sesame seed bun. This Portland-based burger joint serves the best burgers in Maine, with each patty full of chuck and brisket perfectly seared on a flattop grille.