Hot fudge cake. From molten chocolate lava cakes to hot brownie sundaes, crumbs are rarely left behind when diners order these popular desserts. Here are 5 restaurant chains with the best hot fudge cake, according to diners. The molten chocolate cake is indulgent and satisfying, with a dense cake and hot fudge core. LongHorn SteakhouseLongHorn Steakhouse has one of the best hot molten chocolate cakes.