Squid ink is generally written as "squid ink" in the ingredients. If you need to list squid ink as an ingredient when writing a recipe or recipe, you can write "squid ink" as a separate ingredient item in the ingredient list. The specific writing method can be based on personal preference and style. Generally, it is listed line by line after other ingredients, for example:

- Squid ink

- Eggs

- Vegetables

- Salt

- Pepper

This clearly lists the squid ink as one of the ingredients. Of course, the specific way to express ingredients depends on your specific situation and recipe style.