In a small frying pan on medium heat, cook onion. After onion begins to soften, add celery, green pepper and carrot and cook until all are softened. Set aside.
In a food processor, combine cooked onion, celery, green pepper and carrot. Add all oyster ball ingredients to the food processor – rice, oysters, pork, parmesan cheese and seasonings.
In 3 shallow medium bowls, individually mix ingredients for flour mixture, egg mixture and breading mixture into the bowl.
Warm a frying pan of vegetable oil for frying.
Meanwhile, roll oyster ball mixture into 1 inch balls.
Dredge balls in flour, coat in egg and roll in breading mixture.
Deep fry until golden brown.
Mix all items for dipping sauce in small bowl.
Serve oyster boulettes with dipping sauce and garnish with capers.