What you do:
In a small cast iron skillet (about 6-7″ diameter) over medium heat, let the skillet get hot. Give a coating of cooking spray. If starting with uncooked meat, add it to the hot skillet with a sprinkle of salt and pepper and pan sear several minutes to your desired finish. If using leftoever meat, toss/turn to warm the meat; this will take 2-3 minutes. (Note: My meat was medium rare from the first grilling.) Look at the skillet as 4 quadrants and push/pile the steak into one quadrant.
Reduce heat to medium low and add the tomatoes to another quadrant, about half the salt and pepper, cover with a lid and let it steam about 2 minutes. Add the arugula and radicchio to the other two quadrants, cover with a lid and steam another 90 seconds to 2 minutes. You just want it warm.
Remove from heat. Sprinkle on the remaining salt and pepper. Add the bleu cheese and drizzle on the olive oil and lemon juice.