Seared Mediterranean Tuna Steaks

Ingredients

• 4 (6-ounce) Yellowfin tuna steaks (about 3/4 inch thick)
• 1/2 teaspoon salt, divided
• 1/2 teaspoon ground coriander
• 1/8 teaspoon black pepper
• Cooking spray
• 1 1/2 cups chopped seeded tomato
• 1/4 cup chopped green onions
• 3 tablespoons chopped fresh parsley
• 1 tablespoon capers, drained
• 1 tablespoon extravirgin olive oil
• 1 tablespoon lemon juice
• 1/2 teaspoon bottled minced garlic
• 12 chopped pitted kalamata olives