Deep-dish meatball marinara pizza - Master recipes

Ingredients

• 250-300ml semi-skimmed milk -
• 500g strong white bread flour, plus extra for dusting -
• 1¼ tsp salt -
• 1½ tsp fast-action dried yeast -
• ½ tbsp caster sugar -
• 5 tbsp olive oil plus extra for proving, the baking tray and crust -
• 230g grated mozzarella -
• 300g pork mince -
• 50g fresh breadcrumbs -
• 1 medium egg yolk -
• ½ tsp fennel seeds, crushed (optional) -
• ½ tbsp fine polenta -
• 20g parmesan -
• a few leaves of oregano, to serve (optional) -
• 1 tbsp olive oil -
• 1 small onion, finely chopped -
• 1 garlic clove, crushed -
• 400g can chopped tomatoes -
• 1 tbsp tomato purée -
• 2 tsp dried oregano -
• 1 tsp sugar -