While your fish is cooking, make the crema and slaw:
For the crema, combine all the ingredients together and mix well. You can use a food processor (without the green onions) and you will get a great green-color to your sauce. Add onions after you have processed. Refrigerate.
For the Slaw, add all ingredients to a bowl, stir. Adjust spices and lime as necessary according to taste.
Heat tortillas over an open flame until warm and just getting browned on both sides. Layer on fish sticks, slaw and crema. Add additional avocado slices, tomatoes, or cucumber (adds a very fresh taste and crunch).