Mushroom and Veggie Pie - European Mushrooms

Ingredients

• 1 tbsp extra-virgin olive oil
• 2 small yellow onions, finely chopped
• 1 medium leek, white and light green parts only, thinly sliced
• 1 tbsp butter
• 300g button mushrooms, quartered or thickly sliced
• 2 medium carrots, peeled and diced
• 2 garlic cloves, crushed
• 100ml dry white wine
• 1 tbsp vegetable starch (or flour)
• 1/2 tbsp wholegrain Dijon mustard
• 2 tbsp crème fraîche
• 1 tsp Worcestershire sauce (e.g. Sanchon)
• 250ml vegetable stock
• 1 small head broccoli, florets cut from stalk
• 80g frozen peas
• 1 400g can Cannellini beans, drained and rinsed
• 4-5 sprigs fresh thyme, leaves removed
• Freshly ground black pepper, to taste
• 1 egg, lightly beaten (for brushing over dough)