Add the chopped pecans to a dry skillet over medium-low heat. Cook for 3 to 5 minutes, stirring frequently, until fragrant. Transfer to a plate and cool completely.
In a small bowl, whisk the honey, lemon juice, cinnamon, vanilla, salt, and optional orange zest until smooth.
Place the chopped apples in a large bowl and immediately toss with half of the dressing to coat the cut surfaces.
Add the halved grapes and remaining dressing. Fold gently until the fruit is evenly coated.
Fold in most of the cooled pecans immediately before serving. Transfer to a shallow bowl and top with the remaining pecans, a light honey drizzle, and mint if desired.