What is 'aromatic oil' and how is it used in ramen?

Aromatic oil, or 'koumi abura,' is a flavored oil that is often added to ramen to enhance its flavor and aroma. It's typically made by infusing a neutral oil with ingredients like garlic, ginger, scallions, and chili flakes. The oil is then drizzled over the top of the ramen just before serving. Aromatic oil can add a layer of complexity and richness to the ramen, and it can also be used to add a spicy kick.