Whisk together your warm water and Gram flour. Leave it to rest, ideally overnight but for at least 2 hours.
When your ready to use the batter, whisk in the 3 tbsp olive oil, salt and some black pepper. Preheat your oven to 200 C.
Heat an oven proof frying pan on the hob. Add the olive oil and heat until almost smoking. Add the rosemary and let it sizzle for a minute or so and flavour the oil. Then pour your batter into the pan, swirl it round to coat the bottom and let it sit on a medium heat for a few more minutes to form the base.
Put the whole pan into the oven and cook for 10-12 minutes until golden and firm on top. Cut into wedges and serve.
