Heat the oil in a frying pan over medium high heat about 1 inch deep. You are aiming to have the oil be about 350-360°F.
While the oil heats up, make the dredging station.
In one bowl whisk together the chick pea flour, arrowroot starch, baking powder, onion powder, garlic powder, salt, pepper, and cumin.
In a separate bowl whisk together the eggs and water until combined.
Dip a piece of fish into the flour mixture, shaking excess off. Dip into the egg mixture and then back into the flour mixture. Set on a plate and continue this process until the oil is heated and all the fish is coated.
Fry each fish for about 1-2 minutes per side until crispy golden and an internal temperature reaches 145° F.
Remove the fish to a wire cooling rack so it doesn't get soggy. Continue frying until all the fish is cooked.
Assemble your tacos by placing a corn tortilla on a plate followed by a piece or 2 of fish. Top with the slaw and a dollop of the sauce. Squeeze some extra lime on top, if desired and a sprinkle of cilantro, if desired.