Cut each potato into 8 parts.
Fry the potatoes until nice and golden, but not too dry.
Place the fried potatoes into a bowl, then mash it with a potato masher until smooth.
Add cornstarch, chicken stock powder, black pepper, and salt. Stir to combine. Then add heavy cream and stir to combine. Shape the mixture into a ball.
On a clean table, sprinkle about 1 tbsp cornstarch. Add potato mixture on top and then roll with rolling pin for about 30 cm x 15 cm and 1 cm thick.
Cut each long potato fry into 1 cm x 15 cm. Sprinkle with cornstarch.
Fry long potato fries with medium high heat or 350°F/170°C until golden brown.
Serve with ketchup or mayonnaise. Enjoy!