Slayers
Sudden Cooking! Follow the Phantom Dragon! (2x7)
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Lina and the gang stop by in a town offering a Dragon Course feast. The workers try to fool Lina and co., with imitations, or whale food.
They notice it, and they go to the back and demand their food. The head chef tells them personally he'd get the dragon and make it himself, making Lina all excited. He offers them to go hunting for the dragon, and they accept. Basically they have trouble capturing the dragon, but they manage to.
In the end, as Lina awaits her food, it is revealed that due to the dragon's poision, it will take long to cook (at least 2 months - 6 months a dish.) Rather waiting for their cuisine, Gourry, Amelia, and Zelgadis drag Lina out of the restaurant as she screams for the dragon cuisine.