Make the rub by mixing together the cocoa powder, chipotle powder, salt, garlic powder, brown sugar, smoked paprika, cayenne and black pepper in a small bowl. Generously sprinkle the steaks with the rub and set aside.
Heat the oil and butter in a large cast-iron skillet over medium-high heat. When the butter has melted and the oil is hot, add the steaks to the skillet and cook as desired, about 4 minutes per side for a perfect medium-rare. Remove from the skillet and let rest for 5 minutes.
For the salad: Meanwhile, add the greens, tomatoes and radishes to a bowl. Add the lemon juice, olive oil and a pinch of salt and pepper. Toss together, making sure everything is coated in the oil and lemon. Add to the center of a platter and top with the Parmesan.
Slice the steak and add to the platter with the salad, then serve.
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