Mix all ingredient for the sauce in a small saucepan. Bring to a simmer over medium heat. Reduce to low. Strain to remove pieces of ginger before serving.
Combine all dry ingredients. Coat all sides of the ahi with the spice mixture.
Heat a skillet with a small amount of oil over medium high heat. When the oil starts to shimmer add the ahi
Sear ahi on all 4 sides. Making sure crust does not burn. Cook to desired temperature.
Place 3/4 cup of cooked rice in 5 bowls. Spoon over sauce. Slice the ahi and place on top of rice. Garnish with radish sprouts or sliced green onions.