Thanks all....I ended up with legs with backs attached, browned them a bit, then added carrots, celery, 1/2 an onion (with skin), a few peppercorns, parsley, 2 cloves of garlic and bay leaf. Put it in my pressure cooker where it is happily hissing and rocking away for 3 hours. Smells good.
My yogurt containers are ready once it's all cooled and skimmed, to freeze it in for her.
Can you believe my farmer's market had no beef bones? I will have to go to the butcher's later in the week.
Watson