- 1 6-ounce ahi tuna steak
- 3 1/2 tablespoons extra-virgin olive oil
- 1 large avocado, peeled, pitted, diced
- 1 serrano chile or jalapeño chile, seeded, deveined, minced
- 1/3 cup chopped fresh cilantro
- 1/3 cup chopped red onion
- 1/4 cup fresh lime juice
- 2 teaspoons chopped fresh oregano
- Heat heavy small skillet over high heat 2 minutes. Brush tuna with 1/2 tablespoon oil; sprinkle with salt and pepper. Place in skillet and sear until brown outside and almost opaque in center, about 3 minutes per side. Cool tuna; dice finely. Combine tuna, remaining 3 tablespoons oil, and all remaining ingredients in medium bowl. Using fork, mix just to blend. Season tartare to taste with salt and pepper and chill.