Chicken Tagine With Lemons

• 8 black olives see note
• 1 onion
• 1 lemon zest fine
• 800 gr chicken (cut into pieces)
• 350 ml lowfat chicken broth
• 30 ml warm water
• 30 ml virgin olive oil
• 9 gr margarine
• 6 gr garlic (finely chopped)
• 5 gr ginger (fresh finely)