Pre-heat the oven to 170°C / 150°C fan / Gas 3. Place the lamb in a roasting tin and using a knife, pierce the shoulder all over. Drain the anchovies and cut each fillet into three, then stuff a piece inside each hole along with a sliver of garlic and a few leaves of rosemary. Season the lamb generously all over and drizzle with oil, then cover with foil and place in the oven for 2 hours. Meanwhile halve the new potatoes and silverskin onions.
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Step 2
Add the potatoes to the lamb tray, turn the oven up to 200°C / 180°C fan / Gas 6 and roast for 30 minutes until starting to brown. Next add the broad beans, peas, white wine and silverskin onions and return to the oven for a further half an hour.
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Step 3
Remove from the oven, crumble the feta cheese over, scatter over the mint and serve.