Preheat your oven to 450 F.
Spread the garlic cloves all over the bottom of a roasting pan.
15 garlic cloves
Place the lamb shanks on top of the garlic, and drizzle some olive oil over them.
5 to 6 lamb shanks, ½ cup olive oil + more for drizzling
Coat the lamb shanks with the cumin, and the onion powder, and season with salt and pepper to taste.
2 tsp. cumin powder, 2 tsp. onion powder, Sea salt and freshly ground black pepper
Place the roasting pan in the oven and roast, uncovered, for about 35 minutes.
Remove the lamb shanks from the oven, and lower the heat to 350 F.
In a bowl, combine the olive oil, oregano, lemon juice, and water. Stir until well combined.
½ cup fresh lemon juice, 3 tsp. dried oregano, 1 cup water
Pour the olive oil and lemon mixture all over the lamb shanks.
Cover the roasting pan with foil, and roast in the oven for 2 ½ hours.
The lamb shanks are ready once the meat is falling off the bone.