key lime
Key limes are rich in vitamin C and citric acid, supporting immune function and providing antioxidant benefits. The fruit also contains small amounts of vitamin A and potassium, with minimal calories per fruit.
About
The key lime (Citrus aurantifolia) is a small, round citrus fruit native to Southeast Asia, though historically associated with the Florida Keys where it became a signature crop. The fruit is typically 1–1.5 inches in diameter with thin, yellow-green skin when ripe and pale yellow-green flesh. Key limes possess a distinctly higher acidity and more floral, aromatic character than Persian limes, with a complex flavor profile featuring notes of apple and bergamot. The juice is characteristically pale yellow and more acidic, making it particularly prized for beverages and desserts where its distinctive tang is essential.
Key limes differ from Persian limes (Citrus latifolia) not only in size and juice composition but also in seediness—key limes typically contain more seeds. The fruit's thin skin makes it more perishable than Persian varieties, and the yield per fruit is lower, contributing to its premium pricing.
Culinary Uses
Key lime juice is the defining ingredient in key lime pie, the iconic American dessert traditionally made with sweetened condensed milk and egg yolks. The juice is also central to Caribbean and Mexican cuisines, where it flavors ceviches, marinades, and seafood preparations. In beverage applications, it appears in margaritas, daiquiris, and punch, where its floral acidity cuts through sweetness and enriches flavor complexity. Key lime's high acidity makes it valuable for ceviche and other acid-cured dishes. The zest, though less commonly used than the juice, provides an aromatic citrus note to desserts and cocktails.