In a bowl, whisk together the eggs, milk, yellow mustard and lemon juice to make the lemon egg wash.
In a separate bowl, pour the seasoned fish fry mix and add Cajun seasoning, garlic powder, and paprika to taste.
Take the fish chunks and toss them in the seasoned fish fry. Shake off the excess.
Dip each piece into the lemon egg wash, then coat it again in the fish fry mix. Shake to cover completely.
Heat vegetable oil in a deep fryer or heavy pot over medium-high heat.
Carefully drop the coated fish into the hot oil and fry until golden brown and crispy, about 3 to 5 minutes.
Remove and drain on paper towels.
Finish with a squeeze of fresh lemon juice and serve hot.