Season beef shanks with salt and pepper. Then heat a dutch oven on medium heat. When the dutch oven is hot, add in oil. Then sear the beef shanks about 5-6 mins each side until golden brown. Remove beef shanks from the dutch oven.
Add in minced celery, carrot, onion, and garlic into the dutch oven. Saute for 5 minutes. Then add in tomato paste. Saute another 3 minutes.
Then add in bay leaves, crushed tomatoes, beef base, dry red wine, salt, chicken stock, and dried rosemary. Mix well together.
Place beef shanks back into the tomato mixture. Place a lid on the dutch oven and insert into a 350 degree oven.
Braise in oven for 2 hrs at 350 degrees.
Remove from the oven and serve with creamy polenta.