Woolton pie recipe

Ingredients

• 325g floury potatoes, eg Maris Piper
• 200g wholemeal flour
• 200g plain flour, plus extra for dusting
• 1 tsp fine sea salt
• 75g cold butter, diced, plus extra for greasing
• 75g chilled lard or white vegetable fat, diced - use vegetarian if required
• 1 egg, separated
• 1½ tbsp olive oil
• 30g unsalted butter
• 4 large onions, sliced
• 800g floury potatoes, eg Maris Piper
• 3 garlic cloves, finely sliced
• 2 x 260g packs young spinach
• freshly grated nutmeg
• 2 tbsp finely chopped parsley
• ½ x 20g pack sage, leaves chopped
• 60g dried breadcrumbs or rolled oats
• 150g extra-mature cheddar, grated - use gluten-fee if required