Like many other wintertime dishes, oden doesn't have a set list of ingredients. This hearty hotpot from Japan comes in different varieties, and many street food vendors cook a number of ingredients and then let customers choose which ones they want to add to the oden broth. Common options include processed fishcakes or fish meatballs, daikon (Japanese radish), hard-boiled eggs, tofu, squid, corn and root vegetables. Though some restaurants sell oden year-round, it's more commonly found in the winter.
Oden broth recipes vary by region, with some places serving a light liquid flavored with kelp and dried fish, and others opting for a heavier, darker soy-and-soup-bone mixture. Some vendors will keep a master broth for the whole season (or longer) and add ingredients as they go to deepen the flavor.