To heat corn tortillas, place a cast-iron skillet over medium heat. Add tortillas and heat 30-60 seconds, flip, then heat an addition 30-60 seconds or until tortilla puffs a bit and develops a bit of color and light char. Repeat with all tortillas and keep warm in a clean dish towel. Alternatively, you can carefully heat tortillas one at a time directly over a gas flame, flipping tortillas with tongs and keeping a very close watch so they don’t catch fire.
To heat flour tortillas, place a stack inside a clean dish towel. Heat for 30 seconds in the microwave. Or, heat them on the stove, as above.
Fresh fish should be kept in the coldest part of your refridgerator or on ice at 32 degrees F.