Capsicum should be a uniform, glossy colour either bright green or deep red. It should be firm and have thick walls. Depending on the variety, it may be mild, sweet, hot or fiery. Capsicums are also called green, red or yellow peppers. The two varieties are sweet pepper or chilli pepper. Sweet peppers are green, orange, red or black capsicums with a mild flavour. Chilli peppers are significantly smaller than sweet peppers. They are also green, orange, red, or black but are extremely hot.