Marinate the beef

• Toss the beef cubes with the soy sauce, oyster sauce, garlic, salt and black pepper.
• Sprinkle over the cornstarch and mix until every piece is coated.

Prepare the potatoes

• Boil the potato chunks in salted water until just tender.
• Drain well and let them steam dry.

Assemble the skewers

• Thread the beef and potato chunks alternately onto the skewers.

Fry until crispy

• Heat the oil in a pan over medium-high heat.
• Fry the skewers, turning, until the beef and potatoes are golden and crispy.
• Drain on paper towels.

Finish and serve

• Sprinkle the skewers with sesame seeds and serve hot.