Heat a medium non-stick skillet over medium heat, add 1 cup walnuts, 1/4 cup granulated sugar and 1 Tbsp butter.
Heat over medium heat for 5 minutes, stirring frequently. When the sugar mixture starts melting, stir constantly until all sugar is melted and nuts are coated.
Transfer immediately onto a sheet of parchment paper and separate the nuts right away. Once the coating hardens transfer them to a bowl and set aside for your salad.