Method
1 In a small, thick-bottomed saucepan, mix together and heat the sour cream, salt, milk, and sugar. Heat until the temperature reads 240°F on a candy thermometer, stirring occasionally.
2 Add the walnuts and a teaspoon of vanilla. Stir until the walnuts are creamy. Remove pan from heat and spread the walnuts out on wax paper or Silpat. Separate using 2 forks if necessary. Let cool to harden.