Cleaning: Peel the peppercorns through the screening process, remove the pepper and other impurities, and then use the home cooking pot to heat the fire until the fragrance is not pasted. Crush: The hot prickly ash seed is crushed with stone or stone to a powder (the smaller the particles, the better). Oyster sauce: Put the fine powder of ground pepper into a boiling water pot and stir it with a spatula or a wooden stick (about 2.5 kg of water plus 1 kg of pricklyash seed powder). At the same time continue to micro-fire heating insulation for about 1 hour, containing most of the fat can gradually float on the surface of the pot. After standing for about 10 minutes, you can use the metal spoon to pull out most of the floating grease. Dump oil: After most of the grease is pumped out, gently press the metal flat ground water scoop for several minutes to promote the accumulation of oil beads in the material, and then use a metal spoon to scoop the oil. Pepper oil seeds generally have an oil yield of about 25%, which is a relatively high-quality seasoning oil for farmers. Clear slag: The oil and oil residue after the oil is drained from the pot can be used as fertilizer or mixed feed.