Using a mix of mushrooms adds character to the flavor of the soup. The nail-shaped Chiodini mushroom ("chiodo" means nail in Italian) grows around the bases of trees on the Montello hillside in the province of Treviso. The Chiodini season lasts only two months-September and October. This mushroom is quite easy to identify due to its shape and small size of about 12 cm/.5 in. Chiodini is my favorite mushroom to use because they're readily available where I live, but try a mix of the best looking mushrooms you can find.
Author: Monica
Ingredients
3 T. olive oil
2 small onions, finely chopped (I prefer shallots as they contain more flavonoids and phenols than other members of the onion genus)