Thai chiles: Thai chiles can be red or green, are only about 1 1/2 inches long and 1/4-inch or less in diameter. They are on the high end of the heat scale. Find them in Asian markets. If unavailable, substitute fresh cayenne chiles or 1/2 teaspoon or more to taste of purchased chile sauce, such as Sriracha. Fresh chiles can be frozen, airtight, for up to 3 months.