In a large bowl, combine the kohlrabi, carrot, sugar, and vinegar. Mix well, then cover and place in the refrigerator to marinate for 1 hour.
Remove the kohlrabi mixture from the refrigerator and drain.
Place a frying pan over high heat, add the oil and fry the garlic until fragrant.
Add the beef, season with 1/2 teaspoon black pepper, and stir-fry the beef for no longer than 3 minutes. Remove from pan and set aside.
In a serving bowl, combine the kohlrabi, carrot, Vietnamese mint, Asian basil, perilla, garlic chips and beef.
Dress with nuoc cham and garnish with the peanuts and fried red shallots.