In a large pot or Dutch oven, add the sliced onions, bay leaves, olive oil, and salt, tossing with a spoon to coat evenly with the oil. Place the rubbed pork roast on top of the onions and carefully pour the Nut Brown Ale down the side of the pot or pan, so as not to wash the rub off the roast. The roast should be between 2/3 and 3/4 submerged in beer. Add the orange juice, cover the pot with a tight-fitting lid, and place into the center of the preheated oven. Let the pork braise for 5 – 6 hours, or until the meat’s internal temperature reads 210°F | 99°C, allowing the collagen to fully break down, making the pork tender, sticky, and delicious. Using tongs and a spatula, carefully remove the pork roast from the braising liquid and place on a cutting board. Tent the roast with aluminum foil and allow it to rest for 20 minutes, making it easier to slice.