Osso Buco is a veal shank. It is an incredible cut of meat that has a flavorful marrow bone attached to it. Go to any butcher and ask for Osso buco and they will know what you are talking about. This recipe goes great with a brisket, short ribs or a shoulder roast too!
I used a blend of black and regular lentils (cooking them for the same amount of time) It really helps to place the mixture in the fridge for a bit to hold the burger together more but if you want to eat it right away, just be very cautious when turning it over, best with a spatula and spoon together. If you are eating the burger with cheese, place the cheese on top immediately after flipping it over to the second side.