Spinach A La Manchega

18 Ounces washed spinach
6 Cups water
1 onion, chopped
4 Ounces tomatoes
2 Tablespoon vinegar
Salt and cumin powder
Olive oil

Bring the water to a boil in a saucepan. Add the spinach and a pinch of salt, cook for a few minutes. Scald the tomatoes for 1 minutes and peel them. Cut them into slices. Heat the oil in a big pan and fry the onions and tomato slices. Drain the cook spinach in a colander thoroughly. Add to the pan, crush the garlic in a bowl, add the cumin and the vinegar. Add the sauce to the spinach and simmer over low heat for 5 minutes.