Start by cutting into the nerves (edges) of the meat. You’ll want to make up to five cuts per piece.
In a large bowl crush your tomato using your hands or tomato crusher. Set this aside
Heat your Dutch oven on the stovetop on a medium-high heat setting.
Once sufficiently heated, melt the butter and 2 tablespoons of EVOO in your Dutch oven, then add the carrots, celery, and onion (soffritto). Cook for 10 minutes.
While the soffritto is cooking, lightly coat your veal shanks with flour.
Add up to 2 tablespoons of beef broth to the soffritto to help soften the ingredients then cover and allow to steam.
Now, using kitchen tongs add the meat to the Dutch oven (on top of the cooking soffritto) to caramelize it, 2-3 minutes on each side and in the meantime, add the white wine.
After about 5 minutes, remove the veal pieces and place them on a plate.
allow to simmer until wine evaporates then add the tomato paste and stir.
Next, add the crushed tomatoes and stir again to meld the ingredients together.
Sprinkle in a touch of salt and pepper then mix through and gently add the veal shanks back into the Dutch oven.
Lightly salt your veal shanks on each side (optional), then slowly add in the rest of the beef broth.
Cover the Dutch oven and simmer the osso buco for 1½ hours, turning the meat every 30 minutes to make sure it doesn’t stick to the bottom of the pot.
After an hour and a half, remove the lid to allow the sauce to reduce further (another 30 minutes).