Esty's Salted Croissants (cheese rogelach)

This is so simple and delicious. Perfect for Shavuot.

Ingredients Croissants: >  1 packet (350 gm) s/r flour >  200 gm salted butter/marge >  350 gm grated Kashkeval >  1 Tub (250 gm) 9% white cheese Topping: >  1 egg white >  Sesame seeds

Steps 1. Put all the ingredients (except the egg white and the sesame seeds) in a bowl and make pastry. 2. Wrap in cling film and let it rest in the fridge for 1 hour. 3. Pre-heat the oven to 200°C. 4. Take the pastry out of the fridge and divide it into 4 quarters. 5. Roll each into a circle and divide into 8, like a pizza. 6. Roll each segment up from the wide to the narrow point. 7. Oil a baking tray and place the croissants on it, with enough room to expand. 8. Brush the croissants with the egg white.  9. Sprinkle the sesame seeds on top. 10. Bake until brown, about 10 minutes. 11. When cool, store in a container.