Sear a tuna steak for two minutes per side, top with avocado salsa, and you've got a restaurant-quality high protein Wednesday dinner at home.
Pat the tuna steaks dry with paper towels and brush both sides with 1 tablespoon olive oil. Season with half of the kosher salt and all the black pepper.
Heat a heavy skillet (preferably cast iron or stainless steel) over high heat until almost smoking.
Add the tuna steaks to the dry, hot skillet and sear for exactly 2 minutes per side for medium-rare; adjust time for preferred doneness but avoid overcooking.
While the tuna cooks, combine diced avocado, cherry tomatoes, red onion, cilantro, lime juice, remaining olive oil, and the rest of the salt in a medium bowl. Gently stir to keep avocado intact.
Transfer the seared tuna steaks onto plates and top immediately with the fresh avocado salsa. Serve at once for best flavor and texture.