In a mixing bowl, combine the flour, salt, pepper, seasoning, if using, and 3 tablespoons olive oil. Add the water and let the mixture sit for at least 1 hour or up to 4 hours, covered at room temperature.

Position the top rack of the oven 8 inches away from the broiler element. Place a cast iron skillet or other over-proof skillet in the oven and preheat the oven and pan to 450 degrees.

When the pan is hot, carefully remove from the oven, pour in 2 tablespoons of olive oil, and swirl the oil to coat the pan. Pour in the batter, sprinkle the top with a little salt, and place the pan back in the oven on the top rack.

Cook for 13-15 minutes or until the batter looks set. Turn on the broiler to high and broil for 3-4 minutes or until the edges are nicely browned and the top is beginning to brown.

Slide the socca out of the pan onto a cutting board, cut, and serve. Leftovers can be stored in the refrigerator in a food storage bag for 3-4 days.