I have been making sweatbreads for many years and have always cooked them a fair length of time until they are nice and crispy. This is true now matter if I grill them or saute in clarified butter. Then I usually serve them on top of crispy proscutto napped with a Madera sauce(from my homemade demi). Typically I get them fresh from the "plant" within a day or two of slaughter. I typicall buy both type, as they come packaged that way. I soak a couple of hours then simmer in acidulated water. Then clean, break into smaller pieces and weight them overnight. Then I poach in a curt boullion for 15 min or so -- then saute them. Which usually is about 15 min until crispy. The other night I skipped the poaching and grilled them for about 20-25 min until crispy. They were fantastic, I think better than usual. I guess what I am asking is... am I cooking them too long with my usual method? I should note that I rarely get any complaints.... I know I have turned many a man, woman, and child on to the pleasures of these luscious morsels....