Mushroom bourguignon

Name: Mushroom bourguignon
Prep time: 45 min
Cook time: 30 min
Total time: 1 h 15 min
Cuisine: European, Mediterranean, French
Ingredients: 20g dried porcini or shiitake mushrooms; 250ml hot vegetable stock - use gluten-free if required; 350g baby onions or shallots; 800g mixed fresh mushrooms (eg chestnut, shiitake, baby button mushrooms); 1 x 250g pack portobello mushrooms, cut into chunky slices; 4 tbsp olive oil; 3 garlic cloves, finely sliced; 1 tbsp tomato purée; 1 tbsp plain flour - use gluten-free if required; 200ml red wine; 2 bay leaves; 3 tbsp crème fraîche or oat fraîche, plus extra to serve (optional) - use crème fraîche if gluten-free not oat fraîche; ½ x 20g pack tarragon, leaves chopped