3 garlic cloves, 2 chopped and 1 left whole
2 leeks, sliced
1 tbsp chopped fresh flatleaf parsley
1 tsp chopped fresh tarragon
4 sprigs thyme, 2 sprigs with leaves removed
salt and freshly ground black pepper
1 tbsp olive oil
25g/1oz unsalted butter
300²µ/10½´Ç³ú mussels
150g/5½oz smoked sausage, such as morteau sausage, sliced
1 thick slice sourdough bread