In Valdelsa the famous red onion of Certaldo is produced, which is also the symbol depicted in the red-and-white flag of the charming village in the province of Florence: it was the counts Alberti, feudal owners of Certaldo during the 12th century, who inserted it iconographically in the official banner. Red onion is therefore not only a simple ingredient to use in the kitchen, but a real identifying element of the city, so that the inhabitants of Certaldo are called "cipolloni". If you want to enhance the red onion of Certaldo, preferably vernina (in the form of a flattened top and a dark red), and make it the protagonist of an exquisite first course, you could try your hand at preparing the onion onion soup from Certaldo. We explain how to do it.
We slice the onions and the potato. Put three tablespoons of oil in a saucepan and when the oil is hot, put the onions and potatoes to brown for 5-7 minutes or until the onion becomes transparent. After preparing the vegetable broth, add it gently into the saucepan until it is completely covered. We cook for about an hour and, at the end of cooking, we pass it all through a sieve. Season with salt and season with a generous grinding of pepper. We cut the bread into slices of about one centimeter, sprinkle with grated pecorino and poppy seeds and then go to the grill. We fry two onion rings. Serve the soup in a deep dish and place the toasted bread on the surface. We end with fried onion rings and two chives.
Photo from Italia a Tavola
...enjoy your meal!