Heat 2 tablespoons peanut oil in a skillet over medium heat. Add 2 tablespoons honey, 3/4 cup peanuts, 4 sliced scallions and 1/2 teaspoon each red pepper flakes and five-spice powder. Cook, stirring, until glazed, about 10 minutes. Stir in 1 teaspoon balsamic vinegar and cook 1 minute. Transfer to a foil-lined baking sheet; season with salt and let cool.