These are small peppers about 2 inches (5 cm) long, with a colour ranging from bright green to yellowish green, and occasionally red.
Their peculiarity lies on the fact that, while their taste is usually mild, a minority (10-25%) are particularly hot.
Whether a given pepper ends up being hot or mild depends on the amount of water and sunlight it receives during its growth, in addition to temperature.
It's said that solely watering the soil of the plant is likely to produce milder pimentos, whilst watering the whole plant, leaves and stalks included, produces peppers of the spicier variety wikipedia