Well, DO think about it. The under-hood air temperature in a modern car can exceed 300 degrees F.

On the last season of Top Gear (a UK TV car show) when they had a TV chef on as a guest, they did a funny piece on cooking under the hood of a car. They took various meat and fish dishes, wrapped in foil and placed them under the hoods of various cars. They then drove the cars hard round a race track for an hour or so and then sampled the results.

Looking at their faces when trying the food the results weren't good...