Tekkadon
From Infogalactic: the planetary knowledge core
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Tekkadon (鉄火丼?) is a rice dish topped with thin-sliced raw tuna sashimi. Spicy tekkadon is made with what can be a mix of spicy ingredients, a spicy orange sauce, or both, usually incorporating spring onions.
Variations
A similar dish made with salmon sashimi is called sakedon.