ron, i think you've got that a bit wrong.
raw meat shouldn't be re-frozen if it's defrosted and not been cooked, but it's fine to freeze it again once it's been cooked.
johnty, i'd chuck it into a casserole pot with a load of veg and/or beans or pulses and some stock on a low light in the oven and leave it for a few hours. i'm pretty sure that would tenderise it and you could have it with some potatoes or crusty bread.