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

Ingredients

• ¼ cup + 2 tablespoons (packed) 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 crushed red pepper flakes
• 6 (6 oz) fillets center-cut salmon, skin removed
• ½ teaspoon kosher salt
• 2 tablespoons vegetable oil, (for cooking)