Italian vegetable pie recipe

INGREDIENTS

• 1 x 7g sachet of dried yeast
• 150 lukewarm water
• ml `00' flour or strong plain (all-purpose bread) flour, plus extra to dust
• 250 softened butter, cut into pieces
• g extra virgin olive oil, plus extra to brush and drizzle
• 25 potatoes
• g salt and freshly ground black pepper
• 3 small onion, thinly sliced
• tbsp courgettes (zucchini), thinly sliced
• 500 artichokes preserved in oil, sliced (reserve 2 tbsp of the oil)
• g spinach
• 1 eggs
• pinch Parmesan, grated