Tien Tsin peppers are a type of chili pepper commonly used in Chinese cuisine, particularly in Szechuan and Hunan dishes. They are small, thin, and red in color, and they pack a good amount of heat. The peppers are often used to add spiciness and flavor to various dishes, including stir-fries, soups, and sauces.

These peppers are sometimes known by other names, such as Chinese red peppers or Chinese dried red chilies. They can be found in Asian grocery stores and are available both in dried and powdered forms. Keep in mind that Tien Tsin peppers are quite spicy, so use them cautiously if you're not accustomed to intense heat in your food.