Beef Pares Quesadilla

Ingredients

• ½ kg beef camto (flank steak)
• salt
• pepper
• 3 tbsp cooking oil
• 6 cups water
• 3 pcs red onion
• ½ cup garlic cloves
• 2 pcs bay leaf
• ½ tbsp peppercorn
• ¼ cup red onion
• ¼ cup white onion
• ¼ cup garlic
• ¼ cup ginger
• 1 cup celery
• 2 pcs star anise
• 2 cups beef broth (from boiling beef)
• ½ cup soy sauce
• ¼ cup brown sugar
• 1 pack tortilla wrapper
• 1 ½ cups grated cheddar cheese
• 1 cup leeks