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Kyaraben (character bento) is one of a famous Japanese lunch box style, and is known nowadays in the world. Since kyaraben booming, several derivation of kyaraben are appeared in Japan.
Karapan, a short form of "character pan" is also getting popular. Pan means bread in Japanese that is based on Portuguese word Pão. As you can see the photo, kyarapan is making character by breads instead of rice in kyaraben. Cooks bake character shaped bread by themselves. And it's also possible to use the bread bought from a shop.
Following is the easy way to make Rilakkuma burger.
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Get ingredients from Albert Heijn.
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Place ingredients.
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Make face by black olive and cheese on a bun, and place on a burger.
Kyaraben workshop; http://tokyodoll.web.fc2.com/workshop/bentoworkshop.html