The worst meal, saving best for last, would smell like a burnt, salty and putrid smelling piece of rotten gym socks. It would have all that combined with the smells of sweat and even blood and dirt. It would taste exactly as it smells.
Alternately the best meal would smell like a light airy pastry stuffed with chocolate and stuff. It would taste like a thick juicy steak, and have the after taste of a tall glass of Coca-Cola.