Winter greens puff pie - Good Food Middle East

Ingredients

• 1 tbsp olive oil
• 1 onion, chopped
• 2 garlic cloves, crushed
• generous pinch nutmeg
• 400g mixed winter greens (we used kale and cavolo nero, any large stems removed and roughly chopped)
• 200g mascarpone
• 30g parmesan or vegetarian alternative, grated
• ½ lemon, juiced
• 320g pack puff pastry
• 1 egg, to glaze