2
Place sugar, corn syrup, water, vinegar, and salt in a medium saucepan and stir to combine. Place over high heat, stirring until sugar is dissolved, about 2 minutes. Bring to a boil and cook until mixture registers 260°F on a candy/fat thermometer, about 5 to 7 minutes. Remove from heat and stir in butter, nutmeg, and vanilla until melted and smooth.