01 - Preheat vegetable oil in a deep fryer or heavy-bottomed skillet to 350°F.
02 - Remove the casing from the boudin sausage. In a mixing bowl, combine the sausage filling with the finely chopped green onions until evenly incorporated.
03 - Roll the seasoned mixture into 1 1/2-inch balls and arrange them on a tray.
04 - Arrange three shallow bowls: place flour in the first, beaten eggs in the second, and breadcrumbs seasoned with cayenne, salt, and black pepper in the third.
05 - Dredge each ball in flour, dip into the beaten egg, then coat thoroughly with the seasoned breadcrumbs. Repeat the coating process for an extra-crisp crust if desired.
06 - Fry the breaded boudin balls in batches for 3 to 4 minutes until golden brown and crispy. Remove with a slotted spoon and drain on paper towels.
07 - Serve hot alongside Creole mustard or remoulade sauce.