When evaluating chilli oil, prioritize the base oil quality (such as non-GMO soybean, rapeseed, or peanut oil) and the chilli-to-oil ratio. High-quality products should use natural spices (Sichuan peppercorns, star anise, garlic) rather than artificial flavorings. Check for sediment consistency; a premium oil should have a visible, crunchy texture of fried chilli flakes and aromatics. Ensure the product has a vibrant red color derived naturally from the peppers, not from synthetic dyes like Sudan Red, which is strictly prohibited.