The jalapeno pepper is a fruit which gives a burning sensation when eaten. When a jalapeno has matured, it is roughly 2-3 inches long. When it is ripe it is red in color. It originates in Mexico and is cultivated there. Jalapeno is especially popular in Mexican food. The cost of jalapeno peppers is $.30 to $.50 per pepper. The cost depends on where the peppers are purchased.