Add brown sugar, butter, orange juice, orange zest, cinnamon, nutmeg, and salt to a medium skillet over medium heat. Once mixture is bubbling, add pecans then cook, stirring frequently, until pecans are golden brown and all of the orange-sugar mixture has adhered to the nuts, 5-6 minutes. Spread nuts out onto a silpat or piece of parchment paper, separating them as best as possible, then cool completely.