Why does mochi (Japanese rice cake) stretch? (2024)

2024/01/12

Q

A

It’s because the properties of the starch change to become soft and stretchy!

Mochi is commonly eaten during Japanese New Year’s celebrations. Have you ever wondered why mochi is so stretchy? In this feature, we will delve into why mochi stretches and explain the property of stretchiness.

The properties of starch change when it absorbs water

Mochi stretches because the properties of the starch content (amylopectin) change, causing it to become soft and stretchy as it absorbs water. This transformation requires not only starch but also moderate levels of moisture and heat.
This change in properties is the reason why mochi, which are sold in stores in a hardened form, become soft and stretchy when they are cooked under the heat of a toaster.

Why does mochi (Japanese rice cake) stretch? (1)

This “stretchiness” property is actually very important in adhesives.

The advantage of stretchiness

If an adhesive is provided with stretchy properties, it will not peel off when the objects it is used on are misaligned or subject to impact. Instead, it will “stick” to these objects. This stickiness prevents damage caused by adhesives coming off in various applications in which they are used. Stretchy adhesives are used in various places, such as on automobiles, smartphones, and buildings.

The main components that contribute to elongation (stretching rate)

Let’s take a look at how the elongation of adhesives varies depending on the main components.

Why does mochi (Japanese rice cake) stretch? (4)

As you can see, the elongation is completely different depending on the main component. However, even adhesives made of a less stretchy main component can be transformed into a more stretchy adhesive by enhancing the main component itself or adding a rubber component. At ThreeBond, we research and develop a variety of adhesives tailored to the applications and needs of our customers. So, how do we measure elongation?

Measuring elongation with a “dumbbell test piece”

At ThreeBond, we use dumbbell test pieces to measure the elongation of the adhesives (how much they stretch) we develop. A dumbbell test piece is pulled from both ends using a tensile testing machine, and the amount that it needs to stretch to reach its breaking point is the elongation.

Why does mochi (Japanese rice cake) stretch? (5)

The dumbbell test pieces are prepared in a shape that conforms to JIS standards.
At ThreeBond, we have established our own ThreeBond Testing Standard (3TS). 3TS is established in accordance with international ISO standards, as well as the JIS standards based on the Japanese Industrial Standardization Act and various other national and industrial standards, enabling us to offer adhesives that have undergone various measurements and evaluations.

A breakdown of familiar queries around you Back to list

Why does mochi (Japanese rice cake) stretch? (2024)

FAQs

Why does mochi (Japanese rice cake) stretch? ›

Mochi stretches because the properties of the starch content (amylopectin) change, causing it to become soft and stretchy as it absorbs water. This transformation requires not only starch but also moderate levels of moisture and heat.

What makes mochi stretchy? ›

Amylopectin is is much more hygroscopic than amylose, which for people who didn't major in chemistry means that Amylopectin absorbs more water. Mochi in its simplest form is just a chewy elastic dough made from fully hydrated Amylopectin.

Why is my mochi dough not stretchy? ›

Why is my mochi not stretchy? Your mochi waffles don't stretch because you mix the mochi directly into the batter, giving it a crisp with a chewy bite on the inside.

How to stop mochi from sticking? ›

9. Transfer the mochi dough on a nonstick silicone mat, or a working surface floured with cooked glutinous rice flour. Apply some cooked glutinous rice flour on the surface of the mochi dough to prevent from getting sticky.

Are you supposed to eat mochi frozen? ›

Should I eat mochi ice cream frozen? Mochi ice cream should be slightly frozen when eaten. Although it shouldn't be completely frozen and solid, it should still be soft and cold.

How to eat mochi rice cake? ›

Typically, grilled or baked mochi is served with soy sauce and wrapped in seaweed (isobe-maki). Some other classic ways to eat it is with anko (sweet red bean paste) or with kinako (soy powder and sugar), but there are many variations.

How do you make mochi stay soft? ›

So make sure you work next to the freezer! If you don't plan to eat the mochi within 2 days, freeze them rather than put them in the fridge. Simply defrost them on the countertop for an hour (or 20 minutes for the ice cream ones) or when the dough is soft to the touch.

How to fix hard mochi? ›

There are a few ways to soften hard, leftover mochi. You can try boiling it to help turn the mochi soft again. If that's not an option, you can also create fried mochi, a crunchy, equally delicious option. Of course, microwaving this treat can work too.

What is the chewy stuff on mochi? ›

Glutinous Rice Flour

This ingredient is essential for mochi's signature chewy texture.

How to make mochi not stick? ›

Mochi is very sticky!

You will want to have cornstarch, potato starch, or tapioca flour on hand to help manage the stickiness. You'll also want to have some water in a cup to dip your spatula in and be ready to soak everything in water when you are finished. This will help make easy cleanup.

Why is my rice cake dough sticky? ›

It is very common for rice flour doughs made with hot water to be a little sticky when you knead it, especially in the beginning. As you continue to knead it, the dough will gradually feel less sticky.

Does mochi need to be cooked? ›

These flavored mochi can be eaten raw or broiled to make puffy and hot. You'll probably have close to 80 patties to eat when you are finished. Preheat oven to Broil or 400 degrees, your choice. Make the dipping sauce with sugar and soy sauce.

Should I keep mochi in the fridge? ›

Storing them in the fridge will make the rice hard, and the mochi will lose their chewy texture. Where possible, store them in a cool place in an airtight container, and consume them within 12 hours.

Is mochi healthier than ice cream? ›

The average mochi ball is about 100 calories. Whereas filling up a bowl of ice cream might equate to over 350 calories, a small 100 calorie snack won't throw off your weight loss goals. A small taste of indulgence will keep you motivated and happy throughout the day.

What does mochi mean in Japanese? ›

In Japan, mochi in general is a type of rice cake.

What makes mochi so chewy? ›

Mochi is a traditional Japanese sweet treat made from glutinous rice that has been pounded into a sticky, chewy, and slight gummy dough. The word “mochi” comes from the Japanese verb “motsu” which means “to pound”, and this process of pounding the rice is what gives mochi its unique texture.

How do you fix stiff mochi? ›

You'll need to put the hardened mochi in a bowl with a small amount of water, then microwave it for a few seconds at a time until it has softened.

What does cornstarch do in mochi? ›

Mochi is very sticky!

You will want to have cornstarch, potato starch, or tapioca flour on hand to help manage the stickiness. You'll also want to have some water in a cup to dip your spatula in and be ready to soak everything in water when you are finished. This will help make easy cleanup.

Is mochi elastic? ›

Mochi is a Japanese rice cake made of mochigome (糯米), a short-grain glutinous rice*. It's naturally white, sticky, elastic, and chewy.

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