Heat your oven to 350°Ff (180°C), and grease a 10″ pan or skillet (cast iron works great) with butter and dust with sugar, shaking the sugar around the pan so it sticks everywhere on the butter and then dust out the excess. You want the entire pan coated with butter and a find dusting of sugar.
In a bowl combine the sugar, vanilla bean, and egg, and beat it with a whisk until thoroughly combined.
Add the flour, mahleb, and sea salt and whisk gently to combine until no dry bits remain. Gently whisk the milk and orange blossom water and stir until homogenous and combined.
Pour the mixture into the prepared pan, arrange fruit on top, and sprinkle with the chunky raw sugar. Bake for 30-45 minutes until brown and just set.
Remove from oven, cool for about 5-10 minutes. Dust lightly with powdered sugar if desired. Serve warm and fresh…this is best right out of the oven!