Campanian kitchen · Eggs
Frittata di cipolle: the refrigerator is empty, but not really
The Italian solution to an empty refrigerator has been the frittata for centuries. It works because eggs and onions are always there.
My mother made frittata di cipolle when she was tired and did not want to cook and there was nothing in the house. Which means she made it regularly. It was never presented as a consolation meal — it was presented as dinner, because that is what it was.
A frittata is not a French omelette. It is not folded, not underdone, not finished in cream. It is cooked through on both sides, golden, served in wedges like a pie. The eggs bind around the filling — in this case, onions cooked until they are sweet and soft — and the result is something that can be eaten hot or at room temperature, for dinner or as a slice of lunch the next day, alone or alongside a salad dressed in olive oil and lemon.
The flip is the only technical challenge. Covering the pan with a plate and inverting the frittata requires confidence. Practice it once and you will never hesitate again.
A word from the lab
Eggs are among the most nutritionally complete foods available — a complete protein source containing all essential amino acids, along with fat-soluble vitamins A, D, E, and K in the yolk, plus choline, which is critical for brain health and membrane synthesis and which most people do not consume in adequate amounts. The onion contributes quercetin — a flavonoid with well-documented anti-inflammatory and antioxidant properties — and inulin-type fructans that function as prebiotic fiber, selectively feeding beneficial gut bacteria. Cooking the onion in olive oil extracts and distributes its fat-soluble aromatic compounds while adding oleic acid and polyphenols to the finished dish.
Two eggs per person is the rule. Four eggs make a frittata for two. Eight eggs make a party.
Ingredients · serves 2–3
Method
Heat the olive oil in a non-stick or well-seasoned skillet over medium heat. Add the sliced onion and cook slowly until completely soft and translucent, about 8–10 minutes. Don't rush — the onion should be sweet, not browned.
Beat the eggs in a bowl with the salt and pepper. Add the Parmesan if using.
Add the cooked onion to the eggs. Stir together.
Pour the egg and onion mixture back into the skillet over medium heat. Cook without stirring until the edges are set and the bottom is golden — about 3 minutes.
Shake the pan occasionally to ensure it isn't sticking.
To flip: cover the pan with a flat plate or lid. Invert the frittata onto the plate. Slide it back into the pan, uncooked side down. Cook another 2 minutes until set.
If you are not confident in the flip, finish the top under a broiler instead.
Slide onto a cutting board. Rest for 2 minutes, then cut into wedges and serve.
Buon appetito.