Steamed Pungent Cod With Cabbage

• 4 leaves of napa
• 3/4 filet of cod (thick)
• 350 ml water
• 80 gr sweet mixed pickles
• 60 ml pickle juice
• 14 gr rock sugar (crushed)
• 16 ml vinegar (white)
• 7 ml soy sauce (thin)
• 5 ml sesame oil
• 3 gr ginger root (fresh)