In a large shallow dish mix the peppers and the coriander.
Roll the steaks in the mixture to cover evenly both sides.
In a large bowl mix olive oil, mustard, garlic, orange juice, and stir.
Put the potatoes in the mix and stir.
For the filling:
Place roasted beets and boiled potatoes in a bowl, and mash slightly together with a fork.
Add eggs, nuts, mustard, mint, mozzarella, cream cheese, salt and pepper, and stir.