Alex Stupak's spicy, tangy salsa, made with 50 dried árbol chiles, is an amazing all-purpose hot sauce. According to Stupak, the salsa lasts indefinitely and even improves with age. Slideshow: Sensational Salsas
In a mortar or spice grinder, combine the cumin seeds, allspice berries, cloves and oregano and finely grind. Transfer to a blender.
In a small skillet, toast the sesame seeds over moderate heat, stirring, until golden, 3 to 5 minutes. Transfer the seeds to the blender. Add the pumpkin seeds to the skillet and toast over moderate heat, tossing occasionally, until golden, 3 to 5 minutes. Transfer the pumpkin seeds to the blender.
Add all of the remaining ingredients to the blender and puree until smooth. Funnel the salsa into a glass jar or bottle and chill before serving.
The salsa can be covered and refrigerated for at least 3 months.