Take a large sauce pan and saute with olive oil the onions, and or leek, stir for a few minutes and add into the onions the spinach, dill, parsley, rice and stir. Toss in salt, pepper, sugar and cinnamon and let this boil for about 1/2 hour on low heat. Once the mixture is done, take a large bowl pour in the spinach mixture and let this cool off for a while. Add in to cooled of spinach mixture the milk, the eggs, olive oil and feta cheese. Mix and set aside.