Roasted Beef Broth

5 - 6 lbs beef marrow bones (buy them cut into pieces so marrow is exposed)

5 stalks celery (quartered)

2 onions peeled and quartered

4-10 cloves garlic peeled

1 teaspoon black peppercorns

1/2 teaspoon red pepper flakes

1/2 bunch fresh parsley*

3-4 fresh thyme sprigs*

3 dry bay leaves*

1 sprig fresh rosemary*

1 pat butter