What was the primary historical function of the traditional, portable Japanese hibachi device?

Answer

Providing personal warmth or gently cooking small items

Historically, the Japanese hibachi served a much simpler, domestic purpose derived from its etymology as a 'fire basin.' It was designed primarily as a portable charcoal brazier or fire pit intended for personal heating—much like a space heater with a grate—or for the very gentle cooking of minimal food portions. It was not engineered or utilized for the large-scale, high-heat preparation of multi-course meals that characterize the modern American restaurant setting. The cultural shift occurred when this personal heating vessel concept was replaced by the large, commercial flat-top grill.

What was the primary historical function of the traditional, portable Japanese hibachi device?
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