Number 1 ingredient: Tortilla chips. Mission brand is the best. Store brand just like Mission brand is second best. Tostitos are okay, but a little on the flimsy side. Under no circumstance should you use Fritos. That is a different dish altogether. (We call it Frito Pie, and while it is scrum-dilly-icious, it is not taco salad.)
Number 2 ingredient: lettuce. I like bagged salad mix because I am about as lazy as they come.
Number 3 ingredient: the meat and bean mix. Ground beef and Lawry's taco seasoning. Pretty dang easy. Stir in a can of drained pinto beans, but be forewarned that Tait will pick out all the beans.
The toppings: a nice handful of shredded cheese, a healthy dollop of sour cream, and a generous drizzle of hot sauce. Pico Pica is the best, but Tapatio will work in a pinch.
Mix it all together and enjoy.