Scoop 1/4 cup of rice onto plastic wrap and flatten rice. In the middle, place filling on top of the rice. Pull plastic wrap together to shape into a ball.
Under lower to medium low heat, grill each onigiri in a pan with butter until all sides form a crispy crust.
Brush all sides with soy sauce and re-fry all sides (30 secs per side) until crispy. Be careful as it burns quickly!
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