
Knead the dough. Dissolve the yeast in slightly warm milk and let it sit for 10 minutes, then beat in the egg. Add sugar and salt. Mix. Pour in flour in small portions and knead the dough. Let it sit for 20 minutes.
While the dough is resting, prepare the butter. It should be soft, but not runny. Place the glass in a pan with water so that the water completely covers it. Bring the water to a boil. While the water is boiling, cut the butter into small pieces so that they can be covered with a glass, put the pieces on top of each other. Cover with a hot glass and wait until the glass cools. The butter will soften and become suitable for work.

Start making puff pastry. Roll out the dough into a layer about 0.5 cm thick. Spread butter on it. Fold each edge to the center to form a square envelope. Press lightly with your hands on top and roll out the dough carefully so as not to tear it. Otherwise, the butter will leak out. Roll it up into a square envelope again. Repeat the procedure twice. Leave the dough for about 15 minutes.

While the dough is rising, prepare the yolk for brushing the croissants. Separate the yolk from the white, carefully pouring it from one half of the shell to the other until all the white has drained onto a saucer. Place the yolk in a small bowl or small bowl, add vanilla sugar and mix thoroughly with a brush. Set aside.

Roll croissants from the prepared dough. To do this, divide the dough into small pieces and carefully roll each of them. Cut the dough into triangles and roll buns.

Start baking the croissants. Place them on a baking tray and let them sit for about 10 minutes so that the croissants rise slightly. Brush the top with yolk. Put in the oven at 180 degrees and bake until golden brown, about 20 minutes.

While the croissants are in the oven, prepare the filling. Mix cream cheese with Dijon mustard, olive oil and lemon juice. Mix until smooth. Cut the red fish and iceberg lettuce into portions.

Take out the finished croissants, cool, cut lengthwise into two halves. Grease with cream cheese cream, put a slice of fish and salad.