Green Beans With Fermented Black Beans And Pork Sauce

• 500 gr chinese green beans
• 130 gr pork (lean ground)
• 60 ml chicken stock
• 30 ml water
• 30 ml soy sauce
• 16 gr fermented black beans
• 16 ml vegetable oil
• 8 gr garlic (minced)
• 5 gr cornstarch
• 2 gr ginger (fresh minced)