Hazırlanışı
1Combine leek, 150g medium onion, 150g medium white onion, 150g medium yellow onion, and 3g shallots in a large pot.
2Add 28g extra virgin olive oil, 5g kosher salt, and 1g freshly ground black pepper to the pot.
3Cook the onions over medium-low heat, stirring occasionally, for 30 minutes until softened and translucent.