Roast mutton shoulder with roast potatoes

Ingredients

• 1 bone-in mutton shoulder (approx. 2.5kg)
• 1 tbsp cumin seeds
• 2 tsp coriander seeds
• 1 tsp allspice berries
• 1 tbsp black peppercorns
• 1 tsp brown sugar
• 1 tbsp sea salt
• 3 preserved lemons, pips removed
• 2 tsp smoked paprika
• 1 tbsp cider vinegar
• 2 red onions
• 1.5kg floury potatoes
• 2 fennel bulbs, finely sliced
• 1 tbsp fennel seeds
• 2 tsp freshly ground black pepper
• Dash vegetable oil
• 1 litre chicken stock
• Peas, broccoli or your favourite greens to serve