Preheat the oven to 300 degrees F.
Season meat with salt and pepper. In a heavy skillet or casserole
, over high heat, sear
the meat in 2 tablespoons extra-virgin olive oil, browning on all sides. Remove meat from the pan and set aside.
Lower heat to medium and gently sweat the sliced onion, celery, bay leaves, garlic, marjoram, and chile pepper in 2 tablespoons of the oil until soft and starting to turn golden. Add the tomatoes
and tomato sauce
to the pan, season, and let reduce for 5 minutes. Deglaze
with wine, add in the lamb
pieces, raise the heat to medium, and when the liquid comes to a simmer
, cover and cook in the oven for 1 hour.
After 1 hour, add the greens to the pot, setting them directly on top of the meat and its juices. Cover and return to the oven for 30 to 45 minutes. Remove from the oven, discard the celery
, bay leaves
, and chile pepper, and transfer the meat and greens
to a serving platter. Top with slivered cheese
and serve immediately.