When it comes to spreading the filling into a King's cake, you have a few options, and making two halves is not the only approach. Here are a couple of common methods you can use:
Single Roll Method: Roll out the dough into a rectangular shape, ensuring it's large enough to accommodate the desired amount of filling. Spread the filling evenly over the dough, leaving a small border around the edges. Then, starting from one of the long sides, tightly roll the dough into a log, encasing the filling. Once rolled, you can shape the log into a circular shape and join the ends together, forming a ring. Ensure the seam is well sealed to prevent the filling from leaking out during baking. This method allows you to have a single continuous filling throughout the King's cake.
Two-Half Method: Alternatively, you can divide the dough into two equal portions. Roll out each portion into a rectangular shape, again ensuring they are large enough to accommodate the filling. Spread the filling evenly over one of the rectangles, leaving a small border. Place the other rectangle of dough on top and seal the edges well. You now have a sandwich of dough with the filling in the middle. Shape the sandwiched dough into a circular shape by joining the ends together, forming a ring. Ensure the seal is secure. With this method, you'll have two distinct layers of dough with the filling in between.
Regardless of the method you choose, it's important to ensure that the filling is evenly distributed and doesn't leak out during baking. You can also decorate the top of the King's cake with icing, sugar, or decorative elements after it has been baked and cooled.