In a large skillet, cook diced onion in olive oil until browned

Add ground turkey and break up with a wooden spoon

Add tomato sauce or substitute with water

Stir in taco seasoning and cook until liquid is reduced

While turkey is cooking, place diced tomatoes, scallions, shredded lettuce, salsa, guacamole, and sour cream in serving dishes so that guests can help themselves to toppings.

Warm the tortillas or taco shells