Quick Beef Black Pepper Udon

Name: Quick Beef Black Pepper Udon
Ingredients: 2 packs Udon noodles (fresh or frozen); 7 oz Fresh beef (sirloin or flank steak); 4 cups Chinese cabbage (chopped); 1 medium White onion (sliced); 1 tbsp Garlic (minced); 1 clove Garlic (minced); 1 tsp Sesame oil; 1 tbsp Soy sauce; 1 tsp Oyster sauce; 1 tsp Cornstarch slurry (1 tsp cornstarch + water); 1 tsp Chinese white rice vinegar; 3 tbsp Dark soy sauce; 1 tbsp Oyster sauce; 2 tsp Fresh ground black pepper; 3 tbsp Water; 1/2 tsp Potato starch