Kidneys in sesame oil , ginger & chinese wine

Ingredients

• 2 pairs of kidneys
• 1 piece of thumb sized old ginger
• 3 tbsp of sesame oil
• 2 tbsp of oyster sauce
• 1 tsp of corn flour
• 2 tbsp of chinese cooking wine
• 1/4 tsp of sugar
• white pepper
• a sprig of coriander leaves for garnishing
• 1/4 up water