Sprout, comté & walnut tart - Good Food Middle East

Ingredients

• flour, for dusting
• 2 tbsp olive oil
• knob of butter
• 1 leek, sliced
• 1 sharp green apple, diced
• 200g Brussels sprouts, shredded
• 1 tbsp lemon juice
• 200ml double cream
• 50g natural yogurt
• 100g comté(or vegetarian alternative), grated, plus extra to serve
• 3 eggs
• freshly grated nutmeg
• handful of walnuts
• 50g pumpkin seeds, blitzed to a crumb
• 150g spelt flour
• 1 tsp dried thyme
• 5g grated parmesanor vegetarian alternative
• 125g butter
• 1 egg yolk