Tender, pink, corned beef, rather than pastrami - like a lady's cheek. Soft, creamy Taleggio cheese rather than Swiss - like soft, rounded limbs. Crackly wheatberry bread - can't think of a sexy descriptor for that.
No nasty sauerkraut.
Sizzle slowly in a buttered pan (rather than buttering the bread - that's too rich) until the cheese runs out and the bread browns and crisps (the low heat is important - otherwise the butter burns before the cheese melts).
Wait two minutes after plating before taking your first bite, or you'll scorch your tongue.
A masterpiece of a lunch.