Heat oil in a saucepan over medium heat. Sautee the onion for 5 minutes, stirring often.
Add the garlic and cook, stirring for 1 minute.
Add the passata (carefully so as it doesn’t splash at you). Then add the chilli and paprika. Season with sea salt & freshly cracked black pepper and add the butter. Cover and simmer for 15 minutes.
Heat the oven to 220oC.
Prepare 2 baking trays by lining them with baking paper.
Slice the zucchini, lengthways into 0.5 cm thick slices. Brush the zucchini with a little olive oil & sprinkle with sea salt & a little sumac. Place in the oven for 15 minutes.
Mix together the ricotta, mozzarella, egg, spinach, parsley, lemon zest and juice, sea salt & freshly cracked black pepper.
Take a large baking dish and place a couple of spoonful’s of the tomato sauce across the base. Place a good tablespoon or more of the ricotta mixture at one end of the zucchini & roll up. Place this in the baking dish & repeat with the other zucchini. Top with the remaining tomato sauce and top with the mozzarella. Drizzle with some extra virgin olive oil & bake for 25 minutes.