Soak sweetbreads in salted water 1 hour; drain.
Put in saucepan; cover with water.
Bring to boil; reduce heat.
Simmer 30 minutes; remove sweetbreads.
Discard fat and connective tissues; split lengthwise.
Sprinkle with salt and pepper.
Broil 10 minutes in hot (450Â°F) broiler; turn to brown both sides.
Brush with butter