Red Chili Pepper History Variety Heat

Red Chili pepper (Lal Mirch) arrived in India during 16th century replacing Pippali. Chili is hotter and easier to grow than Pippali

Peppers in India before Chili Pepper

In India, two types of pepper existed before the arrival of Chili pepper: Black Pepper, and Pippali. Black pepper was called round pepper, and Pippali was called the long pepper. The Pippali appears as small tiny little berries (about the size of poppy seeds) on a cob. The size of dried Pippali spike is similar to dried Cayenne pepper

During the sixteenth century, Chili and  Pippali were both used interchangeably. It was easier to grow Chili peppers, so the Pippali became less available. Nowadays, chili pepper has completely replaced the Pippali in normal cooking except for some specialty items such as pickles

Origin Of Chili Pepper

Chili pepper is native of tropical South America. In 1492, Columbus found chili peppers in West Indies. Columbus thought this was another variety of black pepper.  The original name used by Columbus for these peppers was "Aji", a variation of "Axi" (Aztek).  The name Chili originated from Nahuatil (Aztec) where Chile was referred to "Red".  This name has died out in United States (because of a "State Of Texas" dish called Chili), but remains in use in UK, Australia and most of Asia. In India its name is literal derivative Lal (Red/Chile) Mirch (Pepper).

Portuguese traders introduced Chili pepper to India during 16th century. "Vindaloo" still remains one of the hottest dish prepared in Goa using chili pepper, an old Portuguese colony in India. India is the largest consumer, producer and exporter of Chili pepper.

At present, there are four types of Chili pepper used in India; namely, Lal Mirch, Hari Mirch (Fresh Lal Mirch), Degi Mirch (Paprika) and Simla Mirch( Sweet Bell Pepper). In last few years India claims to have discovered the most pungent pepper in the world called Naga Jolokiai. Details are unknown. It is hard to believe if such a pepper can be used in cooking.

The Chili plant belongs to genus Capsicum and reaches a height of about three feet, with white flowers, resulting in a fruit of varied color and pungency (heat).

Varieties

The genus Capsicum consists of approximately 22 wild species and five domesticated species:
C. annuum Red Chili Pepper, Paprika
C. baccatum Oldest archeological evidence 4500 years ago in Europe
C. chinese The Habanero
C. frutescens The Tabasco
C. pubescens Rocto, Locoto

Heat and Color

The chemical composition of the Capsicum includes Capsaicinoids and Carotenoids. The  pungency is based on the concentration of Capsaicinoids, primarily of capsaicin. The capsaicin is concentrated in the white tissues to which the seeds are attached. 60% of f capsaicin is in the white tissue and 40% in the seeds. Flavor is located Carotenoids, the color of the skin. The stronger the color, the stronger the flavor. As the ground chili pepper ages, it lose the color and the flavor.

How is the Heat measured?

In 1912  W. L. Scoville, devised a method to determine the heat. The method involved determining the amount of sugar to neutralize the heat from the pepper. It was a subjective test. Now a days more complicated technical method (Liquid Chromatography) is for direct measurement of capsaicin.
Only Capsaicin is responsible for the heat; however, Scoville Heat Unit (SHU) is actually the sum of capsaicin and Capsaicinoids. 15 SHU equals 1 ppm capsaicin plus Capsaicinoids.
It should be noted that heat varies dramatically from harvest to harvest, even from plant to plant in the same harvest as well as from pepper to pepper on the plant.

Why people enjoy eating hot peppers?

There are pain receptors called "trigeminal cells" located throughout the mouth, the nose and the throat. Capsaicin irritates these cells sending pain signals to the brain. The brain responds by releasing endorphins giving a  feeling of euphoria. Body also responds with increase of heart rate, metabolism, mouth salivation, and sweating; nose starts to run. Basically, it results in a sensation of well being. 
In Europe, the Chili was introduced as an aphrodisiac for men during the 16th century. In mid-east, it still has the same reputation.

Peppers & SHU

The following table focuses on SHU for most of the Chili peppers used in India and United States.