Step 01
Slice the onions very thinly into half-moons. The thinner you slice them, the smoother the sauce will be.

EatSen · Recipes
One of the oldest and simplest pasta dishes of Venetian and Veneto cuisine. Thinly sliced onions are slowly caramelized in olive oil to create a smooth sauce, then anchovy fillets are melted into the sauce. Thick bigoli pasta is tossed with this rich, sweet-and-salty sauce. Traditionally served as 'mangiare di magro' (a fasting dish).
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per serving
Slice the onions very thinly into half-moons. The thinner you slice them, the smoother the sauce will be.
Heat the olive oil over low heat in a wide, thick-bottomed pan. Add the sliced onions and cook over low heat, stirring occasionally, for 30–35 minutes. The onions will become completely soft, turn from golden to a deep amber color, and develop a smooth consistency. Do not let them burn; caramelize them slowly.
Once the onions are completely soft and have reached a smooth sauce-like consistency, add the finely chopped anchovy fillets. Cook, stirring, for 2–3 minutes, until the anchovies dissolve into the sauce.
If using white wine, add it and cook, stirring, for 2 minutes, until the alcohol has evaporated. The wine will add gloss and a touch of acidity to the sauce.
Meanwhile, bring a large pot of water to a boil and salt it. Cook the bigoli pasta according to the package directions until al dente (usually 8–10 minutes).
Drain the pasta (reserving some pasta water) and transfer it to the sauce pan. Cook over low heat, stirring, for 1 minutes, tossing until the sauce evenly coats the pasta. Adjust the consistency with the reserved pasta water if needed.
Season with freshly ground black pepper and serve warm.
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