Preheat the oven to 425 degrees. Grease a 9-inch cake pan or cast iron.

Combine the flour, currants, salt, baking soda together. Stir in the greek yogurt all at once until a shaggy dough apears. Roll out on a clean surface and knead just until the dough forms into a ball. Flatten out the ball slightly and place on to the prepared cake pan.

In a small bowl, whisk the egg with 1 teaspoon of water and brush the egg mixture onto the dough. Slice a large cross onto the top of the dough. tent with foil leaving enough room to expand.

Place in the oven for 30 minutes, remove the foil and bake for another 10 minutes or until golden brown.