Creating the perfect Failproof Roast Lamb Shoulder is straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 325°F (160°C).
2. Prepare the Lamb: Pat the lamb shoulder dry with paper towels. This will help create a nice crust during roasting.
3. Make the Rub: In a small bowl, mix the minced garlic, chopped rosemary, chopped thyme, olive oil, salt, and black pepper to form a paste.
4. Season the Lamb: Rub the garlic-herb paste all over the lamb shoulder, ensuring it’s thoroughly coated.
5. Prepare Vegetables: In a roasting pan, place the quartered onions, chopped carrots, and celery. This will create a flavorful base for the lamb and will enhance the sauce.
6. Add Broth: Pour the chicken broth around the vegetables in the roasting pan to keep them moist while roasting.
7. Place Lamb: Place the seasoned lamb shoulder on top of the vegetables, and tuck lemon wedges around the pan for added flavor.
8. Roast: Cover the roasting pan with aluminum foil and transfer it to the preheated oven. Roast the lamb for about 3-4 hours, or until it reaches a tender, forkable texture.
9. Remove Foil: After 3-4 hours, remove the foil to allow the lamb to brown. Roast for an additional 30-45 minutes until the meat is well-browned and crispy.
10. Rest: Once done, remove the lamb from the oven. Let it rest for 20-30 minutes before slicing. This enhances juiciness and flavor.

Following these steps will lead you to a delicious roast that is bound to be a favorite at your Easter feast!