- In a wok, heat sesame oil over high heat and add onions. Stirring frequently, let the onions cook for about 1 minute.
- Add hoisin sauce and stir for 30 seconds before adding the udon noodles.
- Stirring the noodles constantly, cook for 3-5 minutes or until the noodles are hot.
- Add soy sauce and sriracha to taste.
- To serve, top with some quick pickled cucumbers and sesame seeds.