Cipollini Onions
What it is
Small, flat, squat, disk-shaped onions (Allium cepa), Italian cipollini ("little onions"), with thin papery skin and pale, sweet flesh. Their flattened shape and small size distinguish them from round pearl/boiling onions.
How it's made
A specific small, flat onion variety harvested young. Higher in residual sugar than standard onions, which is why they caramelize and glaze so beautifully — their signature culinary virtue. The thin skin is fiddly to peel (blanching helps).
Flavor profile
Sweet and mild with a rich, deep onion flavor that intensifies and turns jammy-sweet when roasted or braised. Less sharp than a standard onion; built for caramelization.
Culinary uses
Roasted whole, braised, glazed (agrodolce sweet-sour with balsamic — a classic Italian preparation), grilled on skewers, added whole to stews and roasts, or used in cipolline in agrodolce as an antipasto. Their shape holds up beautifully whole. Pairs with balsamic, butter, thyme, roasted meats, and red wine.
Regional variations
Italian cooking is the spiritual home (agrodolce, sott'olio preserved). They appear across Mediterranean and modern European/American cooking as a "specialty" small onion for glazing and roasting.
Cultural & historical context
A traditional Italian market onion long used for sweet-sour preserves and festive roasted dishes, cipollini became a fashionable specialty-produce item abroad as Italian cooking globalized — prized precisely for the caramelizing sweetness that ordinary onions can't match.
Substitution & sourcing — Pearl onions or quartered small yellow onions substitute for braises, but lose the flat shape and some sweetness; shallots are an alternative for glazing. Found at Italian markets, farmers' markets, and well-stocked groceries (often in net bags). Blanch 30 seconds to loosen the clingy skins. Choose firm, dry bulbs.
Reference notes
Tags: `allium`, `onion`, `italian`, `caramelizing`, `glazing`. Related ingredients: [Pearl Onions], [Shallots], [Egyptian Walking Onion]. Related cuisines: Italian, Mediterranean. Suggested links: an agrodolce technique note; cross-link the small-onion (pearl/cipollini/rakkyo) family.