Possible Clues:

• Cooks, like clams
• Makes plenty angry
• Cooks, as artichokes
• Decreases, in a way?
• Vaporizes
• Cooks, as asparagus
• Cooks' company on board
• In 15 across, finishing school for cooks, in a way
• Prepares, as some rice
• Prepares vegetables, perhaps