Sift the bread flour and baking powder into the mixture bowl. Add cold butter and use you fingertips lightly nib until mix it well. Add the beaten egg and yogurt. Whisk to combined. Gather the dough into the ball and divide into two part. Wrapped it for 30 minutes.

Turn it on the flour surface. Roll the dough gently in circle, cut it into 8 parts. Place mozzarella cheese and beef Tongue on the dough, roll it. Place on the baking paper on baking tray. Brush the top with egg glaze and sprinkle the oregano.

Preheat the oven at 200 degrees celsius, bake for 15-20 minutes or until turn to golden brown.