As much as any one of us loves to cook, and may well on any given day, eat, live and breathe food, there will be times when when you’ve had all you can take of microwave imploded frozen pizza, greasy stoves, kitchen conflagrations and dirty dishes. Don't tell me otherwise; you'd be a fibber. My friend Luca has rather more of such days than most, and is the inspiration behind this feast of a sandwich, that gives every indication of appealing to more than just fungi fanatics or (more or les...