Separate the egg whites from the yolk. Sift the flour once. Preheat the oven. Gas:180°C, Electric: 200°C

While beating the egg yolk, add in 20 g of sugar. Mix well with a whisk (it doesn't have to form peaks).

Add the water + oil and mix well (measure them together).

Add the flour all at once while sifting a second time. Using a whisk, stir in a circular motion from the center, mixing everything together (it should be the same consistency as pancake mix).

Add 40 g of sugar, separated into 3 batches, to the egg whites and form stiff peaks, making a meringue. Refer to Steps 19 and 29.

Add 1/3 of the meringue from Step 5 into the mixture from Step 4 and mix in neatly.

Next, add 1/3 of the meringue and from the top of the batter, gradually fold in towards the bottom to mix it in (it's okay if there is some batter that didn't get mixed in on the bottom).

Lastly, add the rest of the meringue and mix while breaking down the stiffness of the egg whites (lightly from the top of the batter).

Switch to a spatula. Stir the bottom of the bowl (about 10-15 times).

Pour into the ungreased cake mold, hold the cylinder, and tap on the counter to release the air bubbles. It's okay to rub off the batter on the sides of the bowl with the spatula. The picture shows the middle of this step.

Bake for 10 minutes at 180°C, then lower the heat to 160°C and bake for another 20 minutes. After the first 10 minutes of baking, cut 5 notches in the surface so that it will expand nicely.

It's done baking! (Use 1 medium egg and 2 large eggs.) If you use 3 large eggs, it has the tendency to expand too much.

After it has baked, flip it upside down and place on an upside down mug to cool.

With a knife or skewer, slowly and gently remove from the mold.

When cut, it will look like this. It's quite moist and fluffy!

For a 10 cm mold, just use 1 large egg. It's okay to use just one beater on the mixer. If you use both beaters, the mixture will jump out and splatter and the foam will be uneven.

The state of the meringue. It should form stiff whipped peaks.

This is how it looks after the meringue has finished mixing. If the peaks decrease after adding the egg yolk to the meringue, then the meringue hasn't been whipped enough. If it becomes hard and crumbly, then it was whipped too much.

This is when it has been poured into the cake mold and the edges of the bowl have been rubbed with the spatula. This is a 100 yen ($1) cake mold.

This is when the cake has been baking at 180°C for 12 minutes. It's expanding with all its might. After this, bake itat 160°C for 10 minutes. You don't have to cut notches into the cake.

It's baked! Place it upside down on a tea cup to cool.

After cooling, it fits the mold just right. (Maybe it shrank too much?)

This time, I tried removing it from the mold with a spoon. Use the spoon handle to push firmly to remove. I used a knife for removing the top.

I made one with a little more oil, about 16 ml. So fluffy!

It's useful to use cotton gloves while dealing with the small mold! Always use 100% cotton gloves! Even 100 yen shop ones are good. Buy 2 pairs and layer them. Wear them in place of mittens.

For making meringue in the summer: It's a good idea to place an ice pack underneath the bowl while whipping. Use 10 g of sugar in the egg yolk and 50 g of meringue.

The other option is to preheat to 200°C, bake for 10 minutes at 200°C, cut notches, cover with aluminum foil, and bake at 180°C for 20 minutes.