Beef with chicken

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[...]

2 TBSP vegetable oil , divided Didn't use this 1 lb lean ground beef I used about a pound and a half 2 onions finely chopped I used much less 4 stalks celery[...]