Scotch Bonnet pepper is an extremely hot chile closely related to the habanero. It rates 100,000 to 350,000 units on the Scoville scale and it's about a 9-10 on the relative heat scale. (See the chile pepper heat scale)The chile may vary in color from yellow-green, to orange and even bright red. The average size of this chile is about 1 to 1 1/2 inches long. The Scotch Bonnet is an essential ingredient in Jamaican Jerk spice, and sauce as well as Jamaican curries.
Scotch Bonnet chiles are pretty easy to find in most well-stocked grocery stores. You can typically find them at Trader Joes and Whole Foods markets as well.
If you can't find the Scotch Bonnet chiles or simply wish to try an alternative you can select one of these: