A delicious sandwich featuring sirloin steak cooked with olive oil, fresh herbs, and a flavorful sauce made from mayo, sour cream, anchovies, and Parmesan, layered with fresh vegetables and served on bread.
1: Prepare the sauce by mixing mayo, sour cream, anchovy filets, and Parmesan in a bowl.
2: Heat beef tallow in a skillet over medium-high heat.
3: Season the steak with olive oil, fresh thyme, rosemary, salt, and pepper.
4: Cook the steak until desired doneness is reached, about 4-5 minutes on each side.
5: Remove the steak and let it rest for a few minutes before slicing.
6: Toast the bread in the skillet until golden brown.
7: Assemble the sandwich by layering sliced steak, red onion, serrano pepper, garlic, radicchio, and parsley on the bread.
8: Add the prepared sauce and top with cherry tomatoes.
9: Serve immediately.
