I'll preface this entry by saying: I know this sounds weird and unhealthy. It may be both of those things. It's also delicious.
Brown 2 pounds of ground beef (You can cook some chopped onion in here if you want, or season with cumin)
Make a big old bowl of mashed potatoes
Mix together the mashed potatoes and ground beef.
Put 2-3 Tablespoons of the mixture in a flour or corn tortilla and fry in hot oil. I prefer to deep fry it, myself. I fry it until the corn tortilla has 'cooked' and become a little crispy.
When you remove the friend taco from the oil I recommend standing it on end in a heat-resistant strainer to let the excess oil run out. I choose to sprinkle them with salt now.
My current favorite way to fry is to put the mixture in a corn tortilla and wrap a flour tortilla around the corn tortilla before frying. I'll add pictures next time I make some.
(I think these are best sprinkled with salt and dipped in sour cream.)
I know they sound odd, but I've never had anyone eat them and not crave them again later.