Calf’s sweetbreads with sorrel and shallots

Sweetbread is a catch-all word used by butchers to cover lots of different glands and parts. This is a nuisance to shoppers, for you are likely to be offered testicles and whatever as sweetbreads when what should be on display are two similar pieces of offal known as throatbreads and heartbreads. The one you want is the fist-shaped heartbread - the thymus gland. Butchers often do not charge more for these vastly superior delicacies than would be charged for the stringier throatbreads, which