There are likely better Serbian-style pljeskavica (hamburgers) in Novi Sad, but there certainly aren't better American-style burgers, and the beauty of wildly popular Toster is that it does both! Tucked away in a jam-packed pasaž (passage), it's a Croatian-owned, cash-only joint doing fat, juicy and spicy (Carolina Reaper spicy!) burgers along with a wise devotion to craft beer.
Warning: do not challenge them on their 'Angry' spice levels, you will lose!