Drizzle a generous tablespoon of extra virgin olive oil to a casserole dish and brush around the casserole, add a single layer of the sliced zucchini and season with sea salt and freshly cracked black pepper, add 1/2 of the diced tomatoes on top of the zucchini and evenly spread around, add 1/2 the tuna and evenly spread around, add 1/2 of the whisked eggs, again evenly spreading around, then add another single layer of the sliced zucchini and season again with sea salt and freshly cracked black pepper, add the remainder of the diced tomatoes and evenly spread around, add the remainder of the tuna and evenly spread around, add the remainder of the whisked eggs, freshly shred in about 1 cup of Manchego cheese, sprinkle with some dried oregano and a generous sprinkle of sweet smoked paprika, cover with foil paper