Fry two finely chopped onions until soft.
Put potatoes on to cook.
Add chopped fennel, finely chopped celery, chopped white turnip and finally add white shitake mushrooms and white wine. Put lid on pan and simmer while dabs bake.
Melt large knob of butter in baking pan.
Place some thyme and bay in pan.
Place dabs on herbs.
Squeeze lemon juice over and drizzle with olive oil.
Bake at 200° for twenty minutes.
Serve with garden peas and new potatoes.