Possible Clues:

• Like fattening food
• What's potentially fatty stuffed in typical orifice?
• Very rich
• Heat-generating
• Label space deficient at both ends for heating
• Opening cut on source of veal, not entirely fatty
• Of heat
• Covering mouth that won't close, state food has such value
• Fuel lacking oxygen, hole not entirely creating heat
• Opening mostly provided by state for generating heat