Preheat oven to 375F.
Take the steak out of the marinade and place on a cutting board.
Place butter in a small bowl and try to whip it with a spoon or a small whisk.
Spread butter evenly on top of the steak then layer mozzarella, spinach and feta cheese on top.
Roll the meat tightly starting from the shorter side until the end.
Cut about 20 inches twine pieces, you will probably need 5 pieces.
Tie the pieces around the roll two inches apart to secure.
Heat a skillet or a cast iron skillet on medium high, pour oil and swirl the pan to coat.
Sear pinwheels on each side for 2-3 minutes then remove to a cutting board and let it rest for 5 minutes to handle.
Slice the roll into pinwheels so the twine is in the middle of each one.
Place pinwheels on a baking sheet and pour any remaining fat in the skillet over.
Cover with aluminum foil and bake in the center of your oven for 10-20 minutes minutes or until they reach your desired level of doneness.
Remove from oven and let it rest for 5 minutes before serving.