Perfect for a posh picnic
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To take to the picnic
Put the potatoes in a foil parcel. Slice the beef thinly, transfer to a square of foil, pour over juices and wrap. At the picnic scatter watercress over a platter. Lay the beef over and scatter the artichokes and peppers around. Drizzle over oil from the artichoke jar and pour over the meat juices. Tear the mint over the warm potatoes and serve.