Mushroom Wellington

Mushroom and Chestnut WellingtonServes 6-8 Prep 30 mins Cook 50 mins 500g fresh spinach 4 tbsp olive oil (or butter if you prefer) 3 large brown onions, peeled and sliced 3 sprigs of thyme 500g chestnut or portobello mushrooms, cleaned and chopped to bite-size 2 garlic cloves, crushed 10g dried