Pan-Seared Salmon with Soy Mustard Glaze - Once Upon a Chef

Ingredients

• ¼ cup plus 2 tablespoons dark brown sugar
• ¼ cup soy sauce
• ¼ cup mirin (Japanese sweet rice wine)
• 2 tablespoons sherry vinegar
• 2 tablespoons whole grain mustard, best quality such as Maille
• 2 tablespoons water
• 2 teaspoons cornstarch
• ¼ teaspoon red pepper flakes
• Six (5-6 oz) fillets center-cut salmon, skinned
• ½ teaspoon kosher salt
• 2 tablespoons vegetable oil, for cooking