Spanakopita

Name: Spanakopita
Ingredients: * 1 onion chopped; * 3 tbsp olive oil; * 1/2 cup green onion chopped; * 250 gr frozen spinach; * juice from 1/2 lemon; * 1 1/2 cup grated feta cheese; * 2 egg beaten; * 1 tsp ground nutmeg; * 1 stick butter; * 1 package phyllo pastry sheet; * 1/4 cup dried oregano; * 1/2 cup parmesan grated optional; * salt and pepper to taste