Overview

Capsicum is a genus of flowering plants in the nightshade family, Solanaceae, native to the Americas. Its fruits, known as chili peppers, bell peppers, or simply peppers, range from sweet and mild to intensely hot, with heat concentrated in the placental tissue and seeds. Capsicum species are cultivated worldwide as vegetables, spices, and medicines, and are foundational to many regional cuisines.

Origin and history

Capsicum species are native to the Americas, with centers of diversity in Bolivia, Brazil, and Mexico [2]. Archaeological evidence from sites in Ecuador and Peru suggests chili peppers were domesticated at least 6,000 years ago, with starch grain analysis confirming their use in the Andes by 2500 BCE [3]. Five species were domesticated independently in different regions: Capsicum annuum in Mexico and Central America, Capsicum frutescens in the Caribbean and South America, Capsicum chinense in the Amazon basin, Capsicum baccatum in Bolivia and Peru, and Capsicum pubescens in the high Andes [1]. After 1492, Capsicum spread rapidly via Portuguese and Spanish trade routes to Africa, Asia, and Europe, becoming integral to cuisines from India to Korea within a century [2].

Varieties and aliases

  • Capsicum annuum: includes bell peppers, jalapeño, serrano, cayenne, poblano, and many others. The most widely cultivated species.
  • Capsicum frutescens: includes tabasco pepper, bird’s eye chili. Often confused with C. annuum but distinguished by upright fruit and perennial growth habit.
  • Capsicum chinense: includes habanero, Scotch bonnet, ghost pepper (Bhut Jolokia). Known for intense heat and fruity aroma.
  • Capsicum baccatum: includes aji amarillo, aji limón. Common in South American cuisines, with distinctive yellow-orange color and citrus notes.
  • Capsicum pubescens: includes rocoto, manzano. Distinguished by purple flowers and black seeds; adapted to cooler highland climates.
  • Common aliases: chili, chile, aji, paprika (when dried and ground), pimiento, bell pepper, sweet pepper.

Culinary uses

Capsicum fruits are used fresh, dried, roasted, pickled, or ground into powders and pastes. Fresh peppers are eaten raw in salsas, salads, and as garnishes. Dried peppers are rehydrated for sauces, moles, and stews, or ground into chili powder and paprika. In Mexican cuisine, dried ancho (poblano), guajillo, and pasilla peppers form the base of moles and adobos. In Thai cuisine, bird’s eye chilies are pounded into curry pastes and used in stir-fries. In Korean cuisine, gochugaru (coarsely ground red pepper) is essential for kimchi and gochujang. In Hungarian cuisine, sweet paprika is a defining ingredient in goulash and paprikash. Capsaicin, the compound responsible for heat, is also extracted for medicinal and topical uses [2].

Cross-cuisine context

Capsicum peppers are a rare ingredient that is both globally ubiquitous and deeply rooted in a single origin region. In Mexican cuisine, fresh and dried chiles are not merely seasonings but structural ingredients that define entire dish categories: chiles rellenos, chiles en nogada, and the trinity of dried chiles in mole poblano. No other cuisine in the Yum corpus uses chiles in quite the same structural way.

In Korean cuisine, gochugaru and gochujang (fermented chili paste) are foundational, but the pepper itself is typically processed rather than used whole. In Sichuan cuisine, dried chilies are used for fragrance and heat in oil-based preparations. In Thai cuisine, fresh bird’s eye chilies provide sharp, immediate heat. In Peruvian cuisine, aji amarillo and aji panca are used fresh and dried in sauces and stews, closer in spirit to Mexican usage than to East Asian preparations. In Armenian and Persian cuisines, mild sweet peppers are stuffed or roasted, but hot peppers are less central. In Salvadoran and Guatemalan cuisines, fresh chilies are used in curtidos and salsas, but the dried-chile tradition is less developed than in Mexico.

Notes for cooks

  • Heat level is concentrated in the white pith (placenta) and seeds. Removing them reduces heat significantly while retaining flavor.
  • Capsaicin is oil-soluble, not water-soluble. Drinking milk or yogurt is more effective than water for cooling the mouth.
  • Dried chiles should be toasted briefly in a dry pan or rehydrated in hot water before blending to release their full flavor.