Machine Production of Croquettes and Fried Foods (Cheese-Filled, Meat-Filled)

Croquettes are a signature of Japanese yoshoku (Western-style) cuisine, and they are also common in Taiwan's lunch box shops, supermarket deli counters, and frozen foods. Their offshoots, such as cheese-filled potato balls, meat-filled fried foods, and fried chicken balls (Chicken Kiev types), all share the same structure: an outer layer wrapped around a filling, coated in flour and breadcrumbs, and fried.

Can Croquettes Be Wrapped Automatically?

Yes. The croquette (コロッケ) page on the Japanese website of Japan's RHEON lists the universal encrusting machine KASEIJIN (火星人) CN700, the two-row WN155, and the multi-row encrusting machine for prepared foods, the Mega Former (メガフォーマー). The products the CORNUCOPIA KN551 can make, listed on its U.S. website, also include Croquettes, Potato Balls, Scotch Eggs, Chicken Kiev, Chicken Cordon Bleu, Filled Nuggets, Arancini (Italian fried rice balls), Coxinha (Brazilian chicken croquettes), and more.

When an encrusting machine makes croquettes, the outer layer is mashed potato (or mashed pumpkin or taro), and the filling can be ground meat, cheese, curry, crab cream sauce, and so on. Key points:

• Firmness of the outer layer: Mashed potato that is too wet slumps and sticks; too dry and it cracks. Different potato varieties have different starch contents, so the recipe should be adjusted to the raw ingredients.
• Filling temperature: Cheese and cream sauce fillings are best chilled until they can hold a shape, so they do not flow during wrapping.
• Shape: The encrusting machine produces round balls; to make oval, flattened croquettes, a shaping conveyor or flattening device is connected.

For plain potato croquettes without filling, a forming machine can also press out the shape directly.

How Are Flour Dusting and Breading Connected?

The most typical coating sequence for Japanese fried foods is "flour → egg wash or batter → breadcrumbs." On a production line, this usually corresponds to three pieces of equipment:

1. Flour duster (predust applicator): Coats the surface of the formed products with a layer of dry flour first, helping the subsequent batter adhere.
2. Batter applicator: The products pass through a batter curtain or immersion tank and are coated with a layer of batter.
3. Breader: The products roll over a bed of breadcrumbs so the top and bottom are evenly coated, and excess crumbs are removed.

The conveyor speeds between the three stages must match the encrusting machine's output. For small-scale production, you can also mechanize just the encrusting step and keep coating by hand.

Should They Be Frozen Before Frying?

It depends on how the product is sold:

• Made and fried to order: Lunch box shops and deli counters that make and fry on the same day can simply refrigerate their prepped items.
• Frozen raw: Blast frozen right after breading, to be fried by consumers or restaurants themselves. Freezing sets the shape and keeps the breadcrumbs from falling off.
• Par-fried, then frozen: Fried briefly to set the shape and color, then blast frozen. Consumers simply re-fry or heat them in an oven.

When frozen croquettes go into the fryer, the outside cooks first while the inside is still cold, and if the temperature is not controlled properly, they tend to split open in the oil; this is why frozen products list a recommended oil temperature and time on the package. For frozen transport, under Article 8 of the Regulations on Good Hygiene Practice for Food (食品良好衛生規範準則), the ambient temperature of frozen compartments must not be higher than -12°C.

Hygiene and Safety

• When the filling contains meat, keep raw and cooked areas separate to prevent cross-contamination.
• Flour dusting and breading areas tend to raise dust, and slippery floors also need attention.
• Before cleaning the encrusting machine and coating equipment, stop the machine, cut the power, and apply lockout/tagout in accordance with Article 57 of the Occupational Safety and Health Facilities Regulations (職業安全衛生設施規則).

None of the models listed on Dong-Yih Machinery's website indicate croquettes or fried foods as suitable products. If you have this kind of need, call 06-257-4644 or ask through our Contact page. For filled fried foods from other countries, see Mechanizing Specialty Snacks from Around the World; for meatballs, see Machine Production of Meatballs, Filled Meatballs, and Lion's Head Meatballs.

FAQ

Q: Can croquettes be made with an encrusting machine?
A: Yes. The croquette page on RHEON's website lists encrusting machines such as the CN700, WN155, and Mega Former, and the KN551 product list also includes Croquettes.

Q: How do you keep the cheese from leaking out of cheese-filled croquettes?
A: Chill the cheese until it holds a shape before wrapping, make sure the outer layer is thick and cohesive enough, coat completely, and control the oil temperature.

Q: Can breading be automated?
A: Yes. The common setup is a flour duster, batter applicator, and breader connected in three stages.

Q: Do frozen croquettes need to be fried first?
A: Both approaches exist. Raw-frozen products are frozen directly after coating; par-fried products are fried briefly to set and then frozen, and each suits different sales channels.