For the slaw, combine the cabbage, onion,1 lime juice plus olive oil. Do a taste test and adjust with salt and pepper as needed ( should need it). Reserve1 hour in the fridge
For the sauce, combine the sour cream, mayonnaise, onion powder, 1 lime juice and chipotle sauce. Adjust as needed with salt(should be ok). If you want more kick, add cayenne pepper.
Prepare the fish as per my baked fish recipe.See url in note
Heat the tacos or whatever you want to use in a pan. Place on a plate, fill with 1-2 fish filets. Sizzle with the sauce and cover with the slaw. If you have fresh coriander, mince a few leaves and throw it in!