500g/1lb 2oz Jersey Royal potatoes, scrubbed clean
1 bunch fresh mint, finely chopped
25g/1oz baby spinach, chopped
50g/2oz wild garlic, chopped
salt and freshly ground black pepper
20²µ/ΒΎ΄Η³ϊ caster sugar
100ml/3Β½fl oz white wine vinegar
250g/9oz unsalted butter, softened
1kg/2 lb 4oz leg of lamb, boned
800g/1lb 12oz fresh peas, podded (or frozen peas)