For the carrot broccoli strudel, cut the broccoli into small florets and dice the carrots. Cook in salted water until al dente and set aside.
Cut the green onion into small rings and cut the mozzarella into small pieces. Mix the ingredients and season with salt and pepper.
Roll out the puff pastry, spread with the filling and roll up. Brush the carrot-broccoli strudel with egg and bake in a preheated oven at 170 °C for about 15-20 minutes.