Meg Thompson's Brussels Sprout, Kale and Feta Pie Recipe

Ingredients

• 1 piece good quality puff pastry (or your own homemade pastry if you prefer)
• 12 Brussels sprouts
• 2 tsp balsamic vinegar
• 2 tsp olive oil
• 1 large onion, peeled & sliced
• 4–5 eggs
• ½ cup milk of choice
• 1 tbsp wholegrain mustard
• Sea salt, to taste
• 100g feta, roughly chopped
• 2 leaves of kale, destemmed & roughly torn