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Soft shell, with a corn tortilla. That's been heated up over a low gas flame or in a dry skillet (preferably gas flame).. Or grilled. None of that heating up in the microwave bs.
I will make homemade hard shell tacos on occasion though. I'll do ground beef with chopped russet potato, garlic, onion, jalepeno, and some seasonings and maybe add just a little bit of tomato sauce. Then I'll lightly fry a corn tortilla until it's soft enough to fold in half, add some of the filling, fold, and fry in oil until crispy!
I'm not really a fan of flour tortillas anymore. They're too filling. Plus corn ones are much better for you.