Ground beef
Old El Paso seasoning mix or the natural equivalent
Shredded lettuce
Chopped up tomatoes
Grated cheese (American or Cheddar)
Tortilla chips
Salsa

Brown the ground beef in a frying pan, seasoning it with the mix or whatever you do instead. (I use the mix and add salsa and onions to it).

Mix the beef, lettuce, tomatoes, cheese and salsa in a bowl. Add the tortilla chips or serve separately, depending on your scruples about moist chips. Improvise as desired.