Add about 3/4 cup mayo to large mixing bowl.
Add about 1/2 cup sour cream.
Add about 1/4 cup fresh chopped cilantro.
Roll lime on counter with hand to loosen juice.
Add the juice of 2 limes.
Add about 1 tablespoon of sugar and 2 teaspoons kosher salt. Add pepper If desired.
Place about 3 cups of slaw into bowl and mix.
Taste and adjust with more salt and sugar until it's to your liking. Cover and place in refrigerator for at least 1 hour.
Place on top of your fish tacos and enjoy! You won't be sorry.