Remove the pork from the fridge 2 hours before cooking. Preheat the oven to 220°C. Pat the skin dry with paper towels. Rub the skin with oil and salt, massaging it into score marks. Place vegetables in a roasting pan, and put the pork on top. Roast for 30 minutes until the skin starts crisping.
Mix all glaze ingredients in a bowl. After the initial 30 minutes, reduce the oven to 180°C. Brush the meat (not the skin) with glaze. Cook for 2 hours, basting with glaze every 30 minutes. The internal temperature should reach 65°C.
After the first hour of cooking, place the prepared vegetables in a separate roasting pan. Drizzle with oil and sprinkle with herbs, salt, and pepper. Roast for 1 hour, turning occasionally, until golden and tender.
Remove the pork and vegetables and keep them warm. Place the roasting pan on the stove over medium heat. Sprinkle in the flour and stir for 1 minute. Gradually add the stock, stirring constantly. Simmer until thickened. Strain before serving.