Combine mushrooms, wine, 60ml water, sugar, salt, bay leaf, garlic and olive oil in a saucepan.  Add peppercorns and coriander seeds to a small piece of muslin cloth and tie tightly to enclose.  Add to the saucepan.  

Bring the ingredients to a gentle boil then reduce heat and simmer for 5 mins, stirring often.  

Allow mushrooms to cool then transfer to a sterilised jar, pack in the thyme sprigs and close the lid.  Allow to marinate in the refrigerator for at least 2 days before serving with prepared Patties Party Pies.