Mushroom bourguignon pithivier

Name: Mushroom bourguignon pithivier
Prep time: 40 min
Cook time: 1 h 30 min
Total time: 2 h 10 min
Cuisine: French, Mediterranean, European
Ingredients: 250g chestnut mushrooms roughly chopped; 150g portobello mushrooms roughly chopped; ½ tbsp vegetable oil; 2 shallots peeled, trimmed and quartered lengthways; 1 carrot roughly chopped; 3 thyme sprigs leaves picked; 1 garlic clove crushed; ½ tbsp tomato purée; 1½ tbsp plain flour plus extra for dusting; 125ml red wine (check it's vegan); 250ml vegan vegetable stock; 500g vegan puff pastry block; soya milk for glazing