it 's a dish that 's best served cold 
(ROOT (S (NP (PRP it)) (VP (VBZ 's) (NP (NP (DT a) (NN dish)) (SBAR (WHNP (WDT that)) (S (VP (VBZ 's) (ADVP (RBS best)) (VP (VBN served) (ADVP (JJ cold))))))))))
(ROOT (S (NP (PRP )) (VP (VBZ ) (NP (NP (DT ) (NN )) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (ADVP (RBS )) (VP (VBN ) (ADVP (JJ ))))))))))