Gene's Indian Kabob Sauce

• 2 onions
• 2 nonfat yoghurt (plain)
• 1 lemon juice
• 1 sugar
• 12 gr cumin seeds (ground)
• 12 gr coriander seeds (ground)
• 3 gr garam masala
• 3 gr ginger (fresh ground)
• 2 gr cayanne pepper
• 1 gr turmeric