Grilled Scallop with Butter & Soy Sauce (Uofuku Kuromon Market) Osaka, Japan!

Grilled Scallop with Butter & Soy Sauce
Location: Uofuku in Kuromon Market (Osaka, Japan)
This food stand in Kuromon Market is known for their grilled scallops with butter & soy sauce. They offer 3 different sizes of scallops and grill them over charcoal.
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Is it just pure soy sauce?