Restaurant Hubert's Shiitakes à la Grecque

Ingredients

• 250 ml dry white wine
• 200 ml white wine vinegar
• 200 ml extra-virgin olive oil, plus extra to serve
• 2 tsp caster sugar
• 2 fresh bay leaves
• 2 tsp coriander seeds
• 2 tsp celery seeds
• 1 tsp fennel seeds
• ¼ tsp black peppercorns
• 400 gm shiitake mushrooms
• Olive oil, for brushing
• Bay oil
• ¼ cup (firmly packed) torn flat-leaf parsley
• 5 fresh bay leaves, torn
• 125 ml grapeseed oil (½ cup)