Italian vegetable pie recipe

Ingredients

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