Spinach Saag - cooking recipe

Ingredients

1 (8 ounce) box frozen spinach
2 tablespoons oil
1 onion, finely chopped
2 chopped tomatoes
1/2 teaspoon minced garlic clove
1/2 teaspoon ginger paste
1/2 teaspoon ground cumin
1/2 teaspoon ground coriander
1/4 teaspoon turmeric powder
1/4 teaspoon red chili powder (indian red chili powder, not regular)
1/2 cup plain yogurt

Preparation

Boil spinach until most all of the water has boiled out, set aside. (Puree spinach in food processor or blender).
Saute onions until golden. Add tomatoes, ginger and garlic. Mix well, add dry seasoning.
Stir constantly until it thickens, then add spinach, mix well.
Cook 2 minutes. Salt to taste.
Turn off heat, add plain yogurt a little at a time.
Serve with basmati rice.