Breakdown of benishouga o ireru.

Questions & Answers about benishouga o ireru.
を marks the direct object of the verb. In this sentence, 紅しょうが is the thing being added, so it takes を.
- 紅しょうがを入れる
- literally: put in / add red pickled ginger
This is very similar to how English uses the object after a verb, except Japanese shows that relationship with a particle.
入れる is in the plain non-past form (also called the dictionary form).
That form can mean different things depending on context, such as:
- to add / to put in as a general action
- will add / will put in
- an instruction style, especially in recipes or manuals
In a recipe, 入れる often sounds like a step in a procedure: add (it).