Mix the lime juice, olive oil, and other seasonings for the cod. Toss the fish to coat and set this aside for at least 15 minutes.
While the fish is marinating, start slicing your cabbage, onions and whatever other toppings you are using.
Mix your cabbage, red onions, cilantro, lime juice, and salt. Set aside.
Mix your crema, jalapeno, and salt. Set this aside as well.
Set your oven to broil, on high if you have that setting.
Place the fish on a baking sheet.
Broil for 5 minutes, or maybe a little longer if it is a thick filet.
Remove from the oven.
Char your tortillas.
Break your fish into smaller pieces, and assemble the tacos.
That is it!! Now, sit back and enjoy. You deserve it.