Steps
1. Season the tuna steak with salt and pepper on both sides.
2. Heat olive oil in a non-stick skillet over medium-high heat.
3. Sear the tuna steak for about 2 minutes on each side for medium-rare, or longer if desired.
4. In a small bowl, combine diced avocado, tomato, red onion, lime juice, chili flakes, salt, and pepper.
5. Mix the avocado salsa gently to maintain texture.
6. Plate the tuna steak and top with the avocado salsa.
7. Garnish with fresh cilantro and serve immediately.