First off, I'm not entirely sure this ought to be
called a taco salad, as my knowledge of Mexican food
is a bit hazy. The title's close enough for Gummint
work, I say.
What you'll need:
tomato sauce or spaghetti sauce
(I use Ragu)
several 6" corn tortillas
How much of each? Use them in whatever proportions
you like. You can also add other things like green onions
and sour cream.
Brown the ground beef. While that's cooking you can
grate the cheese and slice the lettuce up into small
strips. Cut the tomato into small chunks too. When the
beef is mostly browned, drain it well, then dump in
some Ragu/tomato sauce, cover, and simmer over low
heat for a while. You don't want to use too much, as
it'll be very wet and sloppy if you do.
I pack this into my bento box by first lining it
with a pair or tortillas, scooping in some meat, drizzling
it with cheese, lettuce, and tomato, and finally covering
it with another tortilla. (The tortilla lining is to
avoid staining the light plastic box. I don't know that
it's needed, and I don't really want to find out.)
To roll these into little burritos, put a little
bit of each item in a line down the middle of a tortilla,
leaving an inch of space on either end. Then roll it
up into a simple tube and hope that it doesn't fall
apart when you eat it. Some say a dab of melted
cheese can keep it from unrolling, but I haven't had
much luck with that.