Next level cheese, potato and onion pie - Master recipes

Ingredients

• 250g plain flour, plus extra for dusting -
• 50g rye flour (or make up the weight with plain flour) -
• large pinch of cayenne pepper -
• 1tsp onion seeds -
• 25g parmesan or vegetarian alternative, finely grated -
• 125g cold butter, cubed -
• 1 egg, beaten -
• 40g butter -
• 3 large onions, finely sliced -
• 2 bay leaves -
• 1tbsp thyme leaves -
• 1 medium potato (about 350g), halved lengthways and sliced -
• 100ml double cream -
• 150g extra mature cheddar, ½ grated, ½ chopped into small chunks -