What Japanese Bento Gear Is Actually For: The Plastic Grass, the Tiny Fish, and the Little Cups

If you've ever looked inside a Japanese bento, you've probably noticed a few odd things.

A strip of green plastic "grass" standing between the rice and the chicken. A tiny plastic fish full of soy sauce. Little colorful cups holding just a spoonful of side dish.

They look like decorations. But almost every one of them has a job, and it's the same job.

I'm Rin, and I write about Japanese kitchen tools and making housework easier for busy two-income households. This is a follow-up to my post on why Japanese kitchen tools look the way they do. This time, it's the bento box.

The one idea behind all bento gear

A bento is usually packed in the morning and eaten at lunchtime, often without being reheated.

So the food sits in a closed box for hours, and it's eaten at room temperature.

The Kinki regional office of Japan's Ministry of Agriculture, Forestry and Fisheries sums it up in its bento food-safety tips: moisture is the enemy.

Warm food packed straight into the box creates steam, the steam turns into water, and that water helps food spoil. The advice is to let food cool fully and keep liquid under control.

So those "cute" extras? Mostly there to fight water.

The plastic grass (baran): a leaf that became a divider

It started as a real leaf

That jagged green strip is called a baran.

It's named after a real plant, haran (aspidistra). In the Edo period the plant's name was pronounced "baran," and its leaves have long been used to separate sushi and packed foods, or laid underneath them as a decorative mat.

Today you'll mostly see the plastic version, cut into that familiar grass shape.

Why it's still there

A baran is a wall. It keeps a saucy side dish from soaking into the rice next to it, and it keeps strong flavors from mixing.

It's also thin and flexible, so it can bend into whatever gap is left in a crowded box, which a rigid divider can't do.

In the rest of this post (100 yen), you'll find:

• The story behind the tiny fish-shaped soy sauce bottle, and why sauce goes in last

• Why bento side dishes sit in little cups instead of directly in the box

• Why a traditional wooden bento box (magewappa) keeps rice tasting good even after it cools

• A short packing checklist based on Japan's official bento food-safety tips