Mango Tango Tacos

Ingredients

• 1 boneless beef top sirloin steak, cut 3/4 inch thick (about 1 pound)
• 1 package (1.25 ounces) low-sodium taco seasoning mix
• 3 teaspoons olive oil, divided
• 1 cup chopped onion
• 8 whole grain tortillas (8-inch diameter), warmed
• 2 cups shredded lettuce
• 1 cup fat-free shredded Cheddar cheese
• 1/2 cup chunky salsa
• 1 cup chopped fresh mango