Whisk together the heavy cream, butter, corn syrup and salt in a small saucepan and bring to a simmer over medium heat. Once the mixture starts bubbling, remove it from the heat and reserve.
Sprinkle the sugar evenly in a large skillet over medium heat. Cook, without stirring, until the sugar melts and starts caramelizing, about 5 minutes. Continue cooking, swirling the skillet (but not stirring), until the caramel is dark amber, 3 to 5 minutes. Remove the skillet from the heat and quickly pour the warm cream mixture into the caramel, whisking until smooth.
Stir the sriracha into the caramel sauce and then pour the sauce in a small serving bowl to let cool and thicken.
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