Preheat the oven to 350°F (175°C).
Make the syrup: in a small saucepan combine 1/2 cup granulated sugar, 1 Tbsp lemon juice, 1/3 cup water, and 1/4 cup honey. Bring to a boil over medium-high heat, stirring until the sugar dissolves.
Reduce heat and let the syrup maintain a light boil for 4 minutes without stirring, then remove from heat and let cool to room temperature while you prepare the cups.
Pulse the nuts in a food processor until coarsely chopped (about the size of coarse crumbs), then transfer to a medium bowl and stir in 1/2 tsp ground cinnamon.
Stir the 3 Tbsp melted butter into the nut mixture until evenly coated.
Arrange the 30 mini phyllo shells on a rimmed baking sheet and divide the nut mixture evenly among them, about 2 teaspoons per cup, pressing the tops down gently with your fingers.
Bake the filled cups at 350°F for 10 minutes, until the nuts are fragrant and the shells are lightly golden.
Remove the baking sheet from the oven and immediately spoon the cooled syrup over the nuts, adding about 1 teaspoon per cup to let it soak in, then repeat with another 1/2 teaspoon per cup until all syrup is used.Let the baklava cups rest at room temperature for at least 6 hours or overnight to soften and for flavors to meld.
If desired, drizzle melted chocolate over the cooled cups before serving.