For best results, use high-quality extra virgin olive oil. The flavor will significantly impact the final dish. If you prefer a spicier kick, increase the amount of red pepper flakes to your liking. The marinated olive oil can be reserved after the peppers are consumed and used as a flavorful dressing for salads or as a dipping sauce for bread. Sterilizing the jar is important to prevent bacterial growth during the marinating process. You can sterilize it by boiling it in water for 10 minutes, then letting it air dry completely.