Beef with broth

2 lb beef chuck 1/4 c. all-purpose flour 1 tsp Kosher salt 1/4 tsp freshly-grnd black pepper 3 Tbsp. oil 2 Tbsp. unsalted butter 1 lrg onion cut 1/2"-thk[...]

2 tbs olive oil 6 lbs short ribs 1 tsp salt 3/4 tsp ground black pepper 1 large onion , finely chopped 1 medium carrot , finely chopped 1 celery rib, finely[...]