½ cup sugar
2 tablespoons balsamic vinegar
1 ½ cups walnuts
Preheat oven to 350F. Line heavy rimmed baking sheet with foil or wax paper. Coat with a thin layer of oil. Combine sugar and vinegar in small saucepan. Stir over medium heat until sugar dissolves, about 3 minutes. Add nuts; toss to coat. Transfer mixture to baking sheet.
Bake until nuts are deep brown and syrup thickens and coats nuts, stirring occasionally, about 10 minutes. Cool completely on baking sheet. Break nuts apart. This dish may be made 2 days ahead and stored in an airtight container at room temperature. Yields 1 ½ cups.