1 medium carrot, peeled, finely sliced
12 wet garlic cloves, peeled
6 button mushrooms, sliced
500g/1lb 2oz new potatoes, peeled and halved
250g/9oz samphire
1 large shallot, peeled, finely sliced
1 tbsp Sevruga caviar
sea salt and freshly ground black pepper
olive oil
500g/1lb 2oz unsalted butter
knob of butter
200g/7oz salted butter
300ml/10fl oz double cream
2 x 250g/9oz boneless halibut fillets
300ml/10fl oz white fish stock
200ml/7fl oz champagne