Ingredients
1 red onion
1 tablespoon salt
2 tablespoons sugar
1 part water
2 parts cider vinegar
3/4 pound pollack or hake or other good white fish
1/2 teaspoon ground cumin
1/4 teaspoon ground ancho chile or chipotle
1 tablespoon olive oil
1 avocado, cut into 1/8-inch slices, lengthwise
1 bunch cilantro, washed and dried
2 limes, each cut into 6 wedges
12 corn tortillas
Instructions

    For the pickled onions

  1. Slice the onions very thinly and put them in a microwaveable container. Add the salt and sugar. Cover everything with 1 part water to 2 parts vinegar.
  2. Microwave for 1 minute, stir, and microwave for another minute. Cool, then refrigerate overnight (if you have time).

    For the fish tacos

  1. Heat the oven to 350° F. Season the fish with salt, then the cumin and chile. Lay the fish in a baking dish, and sprinkle with the olive oil.
  2. Meanwhile, set out the pickled onions. Slice the avocado and put it in a bowl (I like to squeeze a little lime juice over it so it doesn’t brown). Wash and dry the cilantro and pile it on your counter. Do the same with the lime wedges.
  3. When the oven is hot, bake the fish until just cooked through, about 10 minutes. While the fish roasts, place a large skillet over medium high heat. Add as many tortillas as you can – probably just 2 – and toast for a minute or two on each side, just enough to warm through and leave a light toasting mark; be careful not to let them dry out. Keep the warm tortillas piled under a clean tea towel.
  4. When the fish is ready, serve it with the warm tortillas and all the fixins, and let everyone have at it, making their own dream fish tacos.