Spinach with Tomato Sauce

• 1 lb spinach
• ½ lb tomatoes
• salt and freshly ground pepper

Wash the spinach very well, shake off most of the water and cook in a covered pan with the moisture still clinging to the leaves, until tender, 10-15 minutes. Drain off the water it has made, chop and stir in the butter and a little salt.

While the spinach is cooking, skin and chop the tomatoes. Sweat the chopped onion in a little butter and oil, without browning, for 10-15 minutes. Add