Lean Sauce for Dressed Pasta

Ingredients

• 500 g spaghetti
• 100 g fresh mushrooms
• 70 g butter
• 60 g pine nuts
• 6 salted anchovies
• 8 tomatoes
• 1/4 onion
• 1 tsp flour
• Parmesan

Instructions

1. In half the butter, brown the pine nuts; lift them out dry and pound them in a mortar with the flour.
2. Chop the onion very fine and cook it in the butter left in the pan until well colored; add the tomatoes in pieces with pepper and a little salt, cook, then pass through a sieve.
3. Return the sugo to the fire with the thinly sliced mushrooms, the pine-nut paste (loosened with a little water), and the remaining butter; boil half an hour, adding water to thin it.
4. Melt the anchovies separately with a little of the sauce, off the boil, and stir them in.
5. Drain the spaghetti, dress with the sauce, and add Parmesan if desired. Serves five.