Sweetbreads by John Spottiswood.

Sweetbreads are the soft and delectable thymus glands of calves and lambs. Though it's hard to get fussy teenagers to eat them, there are enough knowledgeable gourmets clamoring for sweetbreads to keep the price fairly high. Freshness is very important--you should plan on preparing them the day you buy them or else freezing them. Like other organ meats, sweetbreads are high in cholesterol.