Lamb loin stuffed with kidney, liver and an olive sauce

By Matt Tebbutt From Saturday Kitchen Ingredients 100g/3½oz black olive tapenade 1 lamb’s kidney, cleaned and diced 55g/2oz lamb’s liver, cleaned and diced 1 tsp chopped fresh tarragon 6 slices (about 55g/2oz) Bayonne ham 1 whole lamb loin (about 500g/1lb 2oz), boned and trimmed …