Heat oven to 425 degrees. In a small saucepan, heat 2 tablespoons of the oil over medium. Stir in garlic until fragrant, 30 seconds. Add soy sauce, mirin, sugar, black pepper and ¼ teaspoon salt, and bring to a simmer. Reduce heat to medium-low and cook, stirring occasionally, until sauce is reduced by about a third and has thickened slightly, 10 to 15 minutes. Stir in ginger and remove from heat. You should have about ½ cup sauce; reserve half of the sauce in a small bowl for serving and set aside.
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