In a large mixing bowl, combine the fresh crab meat, egg, mayonnaise, Dijon mustard, and lemon juice. Add the finely chopped green onions, red onion, paprika, Cajun seasoning, kosher salt, black pepper, cayenne pepper, and panko breadcrumbs. Mix gently with a spatula until all ingredients are evenly distributed, ensuring the mixture remains light and fluffy.

With clean hands, divide the crab mixture into 8 equal portions. Roll each portion into a tight ball, about the size of a golf ball. As you work, ensure the balls maintain their shape without being too compacted, allowing for a tender bite when fried. Set the shaped balls on a plate while you prepare for frying.

In a deep frying pan, pour in about 2 inches of vegetable oil and heat it over medium-high heat. Use a candy thermometer to monitor the temperature, aiming for around 350°F (175°C). To test readiness, drop in a small piece of bread; if it sizzles and browns within about 30 seconds, the oil is hot enough for frying your Cajun Crab Balls.

Carefully add the crab balls to the hot oil in batches, making sure not to overcrowd the pan. Fry them for approximately 2-3 minutes on each side, or until they turn golden brown and crispy. Keep an eye on them, using tongs to gently flip them for even cooking. Once perfectly fried, remove the crab balls and drain them on paper towels.

After frying, place the golden Cajun Crab Balls on a plate lined with paper towels. This will help absorb any excess oil, keeping the crab balls crispy and light. Allow them a few moments to drain while you prepare the remoulade sauce, ensuring each bite is a perfect combination of flavor and texture.

In a small bowl, whisk together the mayonnaise, Dijon mustard, minced garlic, paprika, Cajun seasoning, lemon juice, Worcestershire sauce, and hot sauce until smooth and well combined. Taste and adjust seasoning as desired, adding more hot sauce for kick or lemon juice for brightness. This zesty remoulade sauce complements the Cajun Crab Balls beautifully.

Serve the Cajun Crab Balls hot, alongside the creamy remoulade sauce for delicious dipping. Garnish your dish with a sprinkle of fresh parsley for a pop of color. These bite-sized treats make for an impressive appetizer that will have your guests celebrating their bold Cajun flavors and crispy texture!