Preparing the filling.
Divide the broccoli and cauliflower into florets. (Defrost frozen vegetables and also disassemble into inflorescences or cut). Wash the spinach, dry it, remove the rough stems, and chop the leaves finely. Put the cabbage and spinach in a bowl, season with salt and pepper, add the ricotta and 100 grams of grated mozzarella, and mix.