Preparation
Roll out the croissant dough to 2.5 mm thickness and make squares of 10 x 10 cm. Cut each side in 3 cm and fold them inwards. Press well. Place the filling and brush the dough with egg. If necessary, sprinkle lightly with some cheese and herbs. Allow to rise for around 45 minutes, then steam bake. After baking, possibly decorate with herbs or cheese.