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big leeks , outer leaves trimmed back, washed, olive oil, good knobs butter, divided, garlic, peeled and finely sliced, a few sprigs fresh thyme , leaves picked, a small wineglass white wine, sea salt and freshly ground black pepper, good-quality vegetable or chicken stock, ham , preferably parma, fresh lasagne sheets, all-purpose flour , for dusting, handfuls freshly grated parmesan, plus extra for serving, handful dried porcini mushrooms, ciabatta bread , preferably stale, cut into chunks, sea salt and freshly ground black pepper, olive oil, garlic, crushed, fresh rosemary