Nori Ahi with Soy-Mustard-Port Sauce

Ingredients

• ¼ cup balsamic vinegar
• 3 tablespoons vegetable oil, divided
• 1 cup white miso
• ½ cup port wine
• ¼ cup soy sauce
• 1 cup nori furikake (Japanese seasoning mix, see below)
• 1 cup unsalted butter, cut into pieces
• + 4 more ingredients
• • 1 tablespoon heavy cream
  • ¹/₃ cup Dijon mustard
  • ½ cup dry red wine
  • 2 to 3 pounds ahi tuna

Whisk together mustard and soy sauce in a small bowl. Bring vinegar, red wine, and port to a boil in a saucepan over medium-high heat. Cook 10 minutes or until liquid is reduced to 1/2 cup. Reduce heat to medium-low; add mustard mixture and cream. Simmer 3 minutes, stirring occasionally. Reduce h...

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