6 large garlic bulbs
2 leeks, trimmed and cut into thin rounds
陆 lemon, cut into wedges
1kg/2lb 4oz starchy potatoes, peeled and thinly sliced
1 tbsp chopped fresh tarragon leaves, plus 4 sprigs
1 tbsp fresh thyme leaves
sea salt and freshly ground black pepper
extra virgin olive oil, to drizzle
extra virgin olive oil, for drizzling
sea salt flakes
80g/2戮oz unsalted butter, softened
310ml/陆 pint double cream
1.3kg/3lb whole chicken