Comté, Sprout and Walnut Tart - Pong Cheese

Ingredients

• Flour (for dusting)
• 2 tbsp olive oil
• Knob of butter
• 1 leek (sliced)
• 1 green apple (diced)
• 200g brussels sprouts (shredded)
• 1 tbsp lemon juice
• 200ml double cream
• 50g natural yogurt
• 100g Comté
• 3 eggs
• Freshly grated nutmeg
• Handful of walnuts
• 50g pumpkin seeds (blitzed)
• 150g spelt flour
• 1 tsp dried thyme
• 5g grated parmesan
• 125g butter
• 1 egg yolk