Steps
1. Start by seasoning the tuna steak with salt and pepper on both sides.
2. Heat olive oil in a skillet over medium-high heat. Once hot, sear the tuna steak for about 1-2 minutes on each side, depending on your preferred doneness.
3. While the tuna is cooking, prepare the avocado salsa by mixing the diced avocado, red onion, tomato, lime juice, and a pinch of salt in a bowl.
4. Once the tuna is done, remove it from the skillet and let it rest for a minute.
5. Slice the tuna steak and serve it on a plate topped with the avocado salsa.
6. Garnish with fresh cilantro before serving.