Preheat the oven to 400°. Set the meat in a large roasting pan, fat side up. Season the meat generously with salt and pepper. Around the roast, scatter 10 sprigs each of sage and thyme, 6 of the bay leaves, the shallots and the crushed garlic cloves. Pour in 1 cup of the water and roast for 45 minutes. Reduce the temperature to 275°. Roast the meat for about 2 hours and 15 minutes longer, adding the remaining 1 cup of water to the pan as the juices evaporate. The roast is done when an instant-read thermometer inserted in the thickest part registers 135°.