In almost infinite variety, chili peppers are essential in the cuisines of many cultures. Their growing popularity makes them familiar ingredients to most people. They differ in flavor and in the heat they impart to food. Try several, use very sparingly at first, and enjoy.On a heat scale from 1 to 10, with 10 being the hottest, Pasilla Peppers rate 3. Use in sauces. U.S. origin. 3,000 Heat Units.Pasilla Peppers are also known as Poblano Peppers.