Flat White Onion

Origin Lazio

The delicate sweetness of Lazio's fruit and vegetable tradition

The Flat White Onion of Lazio

The Flat White Onion of Lazio is a traditional variety with an unmistakable appearance: flattened at the ends (hence the "flat" name), bright silvery-white outer skins, medium-small size, and above all a sweet, delicate flavor that clearly distinguishes it from common white onions or the more pungent red and golden varieties. This onion is one of the spring-summer varieties historically grown in the plains and hilly areas of Lazio—particularly in the provinces of Rome, Latina, Frosinone, and Viterbo—where the fertile soil, often of volcanic or alluvial origin, and the temperate Mediterranean climate create optimal conditions for the development of fleshy, juicy, and very sweet bulbs.

The characteristic flattened shape (flattened vertically rather than spherical like common onions) is due to the varietal genetics and makes these onions easily recognizable and particularly prized in the kitchen for their versatility. The skins are thin, the inner flesh is pure white, crunchy when fresh, rich in water and natural sugars, with well-defined, separable concentric layers. The flavor is sweet with just a hint of the sulfurous pungency typical of onions, making them suitable for both raw preparations (salads, dips, bruschetta) and for slow cooking, which further enhances their natural sweetness.

The flat white onion is a key ingredient in traditional Lazio cuisine, used in iconic dishes such as Roman vignarola (a spring stew of broad beans, peas, artichokes, and spring onions); bruschetta with porcini mushrooms, where the sweet white onion balances the intense earthy flavors; delicate soffrittos for fish or vegetable sauces, where it should complement rather than dominate; and countless other recipes that call for aromatic sweetness without being overpowering. It's also excellent simply grilled, oven-roasted, caramelized, or used to make sweet and sour onions preserved in vinegar or oil.
 
 
 

The roots of the onion go back to ancient Mediterranean civilization

The onion (Allium cepa) is one of the oldest vegetables cultivated by humanity, with archaeological evidence attesting to its cultivation in Mesopotamia, Egypt, and the Mediterranean basin for over 5000 years. The Egyptians considered it sacred and a symbol of eternity (due to its infinite concentric layers), the Romans consumed it daily both raw and cooked, and during the Middle Ages it became a staple of the European lower classes, providing nutrition, flavor, and empirically recognized medicinal properties.

In Lazio, the cultivation of sweet white onions consolidated over the centuries, developing local ecotypes perfectly adapted to the region's microclimates and soils. The flat variety in particular was selected for its superior sweetness, good shelf life (though not as exceptional as the golden onions used for storage), and culinary versatility, making it ideal for simple peasant cuisine, where a few simple ingredients were needed to create complex and satisfying flavors.
 
 
 

Choosing the Flat White Onion means delicate flavor and beneficial sulfur compounds

Onions are rich in beneficial bioactive compounds: organosulfur compounds (allicin, diallyl disulfide, thiosulfinates) responsible for the characteristic pungent aroma when cut, with scientifically proven antibacterial, antifungal, antiviral, and antioxidant properties; quercetin and other antioxidant flavonoids, concentrated especially in the outer layers, with anti-inflammatory, cardioprotective, and potentially anti-tumor properties; fructans (inulin, oligofructose), which act as prebiotics, nourishing the beneficial intestinal microbiota; vitamins (C, B6, folic acid); and minerals (potassium, manganese, copper).

They are naturally low in calories (about 40 kcal per 100g), fat-free, and rich in water and fiber. Popular tradition attributes onions to their diuretic, purifying, expectorant (they dissolve phlegm), mild hypoglycemic, and digestive properties. Sweet white varieties, such as the flat Lazio variety, while retaining all these beneficial compounds, are more delicate and digestible than the more pungent red or golden varieties, making them ideal for those with sensitive stomachs or simply preferring mild flavors.
 
 
 

How to Best Use: Flat White Onion

• RAW PREPARATIONS AND SALADS
  Cut the white onion into thin slices or julienne for mixed salads, panzanella, salad organic datterino tomatoes  and onion. Use in bruschetta with fresh tomatoes, pinzimonio. Add to fish carpaccio or carneMarinate it in vinegar e Organic cane sugar for sweet and sour onions.
• FRIED FRIES, SAUCES AND TRADITIONAL PREPARATIONS
  Base for delicate sautés with organic celery e fresh carrots. Use for sauces tomato, tomato and bacon, ragout. Essential for Roman vignarola with Fava beans, fresh organic peas, artichokesAdd to soups, stews, and casseroles.
• BAKED, GRILLED AND CARAMELIZED
  Cut into wedges and roast in the oven with stone-ground new extra virgin olive oil, rosemary, salt. Grill whole or half for side dishes. Caramelize it slowly in a pan with organic butter, Organic cane sugar, balsamic vinegar For caramelizing onions. Use in savory pies, quiches, and focaccias. Make French onion soup.

Product Features

• Variety: Traditional Flat White Onion
• Origin: Lazio
• Shape: Flattened at the poles
• Color: Bright silvery white
• Taste: Sweet and delicate, not very pungent
• Seasonality: Spring-summer (fresh harvests)

Indicative Nutritional Values ​​(per 100g of fresh product)

Energy approximately 40 kcal, Carbohydrates 9-10g (of which sugars 4-5g), Fiber 1,5-2g, Protein 1-1,5g, Fat <0,5g. Rich in organosulfur compounds, quercetin, vitamin C, B6, folic acid, potassium, manganese.
 
 
 

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