Gigantes plaki

INGREDIENTS

• 400g dried butter beans
• 3 tbsp Greek extra virgin olive oil , plus more to serve
• 1 Spanish onion , finely chopped
• 2 garlic cloves , finely chopped
• 2 tbsp tomato purée
• 800g ripe tomatoes , skins removed, roughly chopped
• 1 tsp sugar
• 1 tsp dried oregano
• pinch ground cinnamon
• 2 tbsp chopped flat-leaf parsley , plus extra to serve