Using a large bowl, whisk the chickpea flour, salt and pepper together. Pour in the water, and olive oil and stir to combine. Cover the bowl with a clean dish towel and allow to sit at room temperature for an hour.

Preheat the oven to 450 F. Transfer a 10" cast iron pan to the oven and allow to heat for 10 minutes.

Carefully remove the pan from the oven and grease it with about 1 tbsp of olive oil. Add the chickpea batter into the hot pan. Transfer to the oven and bake for 15-17 minutes. Turn the oven on broil and broil for another 2 minutes to crisp.

Remove from the oven and allow to cool for 5-10 minutes before transferring to a cutting board.

Top with fresh rosemary and salt to taste. Slice into 4 pieces and serve warm with a dip if desired!