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1.
Sift cake flour, baking powder, and baking soda into a large bowl.
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2.
Add sugar and whisk well to combine.
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3.
In a medium bowl, whisk egg and whole milk until well combined.
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4.
Pour the wet ingredients into the dry ingredients and whisk well. Keep the batter in the refrigerator for at least one hour to rest until the batter becomes smooth.
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5.
Pour the batter into a measuring cup or jug. You should have about 1 ¼ cups.
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6.
Heat the taiyaki pan over medium-low heat and grease with neutral oil using a brush.
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7.
Fill the pan mold about 60% full of batter. In the center of each mold, put 1 tbsp of sweet red bean paste (or filling of your choice) and pour more batter on top to cover it.
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8.
Close the lid and immediately flip. Cook for about 2 to 2 ½ minutes on that side. Then flip and cook for another 2 to 2 ½ minutes until golden brown. Repeat with the remaining batter.
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9.
Serve warm.
* To store, keep the taiyaki in an airtight container and keep it in the refrigerator for up to 4 days or in the freezer for up to a month. Toast them in a toaster oven or oven until they're crispy on the outside.