It is typically red when dried, with a thin, wrinkled skin. Arbol peppers are commonly used in Mexican cuisine to add intense heat and spice to dishes such as salsas, sauces, and marinades. Despite their small size, arbol peppers pack a punch, ranging from 15,000 to 30,000 Scoville heat units, making them significantly hotter than jalapeos. Use them sparingly to add bold heat and flavor to your favorite dishes.