Mix soy sauce, brown sugar, rock salt, and black pepper together in a saucepan; bring to a boil and cook until sugar and salt are dissolved, 2 to 3 minutes. Remove saucepan from heat and cool marinade.
Cut salmon into strips, with or without the skin. Pour marinade into a shallow bowl and lay salmon strips into the shallow bowl. Refrigerate for 45 minutes.
Preheat oven to 185 degrees F (85 degrees C). Line a baking sheet with aluminum foil and place a wire rack on top. Lay salmon strips on the wire rack,
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