Heat oil in a heavy large Dutch oven over medium high heat.
Dry meat with paper towel.
Season with kosher salt and pepper.
Working in batches, add meat and bones to pot and brown on all sides.
Transfer meat and bones to a bowl and set aside.
Add onions to the Dutch oven and sauté until tender and brown, about 10 minutes.
Add cumin and cinnamon and stir for about 30 seconds.
Add tomatoes, chicken broth, beef broth and bay leaves.
Return meat and bones to pot along with any accumulated juices. Bring to a boil. Reduce heat, cover and simmer 1 ½ hours