There are many varieties of basil. The most common are sweet and hot basil. Hot basil is stronger in flavor and very popular for stir frying with meat. Sweet basil is used in curry dishes and is easy to find fresh all year-round in many supermarkets. The hottest are the very small chilies, and the larger ones are usually milder.
Mature chilies are always red.
Dried chili and ground dried chili are also used in some recipes. All chilies, fresh or dried, need to be handled with care. Wash your hands thoroughly after touching them and do not touch any part of your delicate skin since it can cause a great deal of discomfort. Available in most Asian grocery stores and last only for 1 week in the refrigerator. Scallions can be substituted, if necessary.