675 g (1 1/2 lb) fresh clams or 1 x 290 g (10 oz) can clams, drained
400 g (14 oz) mixed seafood, such as prawns (shrimps), squid and mussels, defrosted if frozen
2 tbsp olive oil
2 cloves garlic, finely chopped
150 ml (1/4 pint) 2/3 cup white wine
150 ml (1/4 pint) 2/3 cup fish stock
2 tbsp chopped tarragon
salt and pepper
675 g (1 1/2 lb) fresh pasta or 350 g (12 oz) dried pasta