To make the syrup: Combine the sugar, honey, water, lemon juice, cinnamon sticks, lemon zest, cloves, and cardamom in a medium saucepan. Cook over medium heat, stirring occasionally with a wooden spoon, until the sugar has dissolved. Reduce the heat to medium-low and cook until the syrup is slightly thickened, about 10 minutes. Remove and discard the cinnamon sticks and lemon zest and set syrup aside to cool.
Using a chef's knife, finely chop the nuts. (Alternatively, if you have a food processor, pulse the nuts until finely chopped.) In a medium mixing bowl, combine the nuts, cinnamon, and salt and stir well to combine.
Melt the butter over low heat in a small saucepan.
Using a pastry brush, lightly coat a 13 by 9-inch or 15 by 10-inch baking dish with some of the melted butter.
Open the package of thawed phyllo and lay the thin sheets on a clean work surface. Measure the phyllo sheets if the type you have purchased measures approximately the same size as the baking dish you are using, then proceed from here. If they are larger than your baking dish, use a chef's knife to cut the phyllo sheets to approximately the same size as your baking dish. Discard any scraps. Cover the sheets with a piece of plastic wrap and a lightly damp kitchen towel, as the sheets of phyllo dry out very quickly if left uncovered.
Position rack in center of oven and preheat the oven to 350?F.
Place one of the sheets of phyllo in the bottom of the buttered baking dish and lightly brush with some of the melted butter. Repeat this procedure with 6 more sheets of phyllo, for a total of 7 layers. Measure about 3/4 cup of the nut mixture and spread the nut mixture evenly over the buttered phyllo sheets. Repeat with 7 more sheets of phyllo, buttering each layer as before, and top these sheets with another 3/4 cup of the nut mixture. Continue this layering process until you have used all of the nut mixture. Layer any remaining sheets of phyllo on top, buttering between each layer, until all of the phyllo sheets have been used.
Use a sharp knife to make four cuts lengthwise through the layered phyllo at 1 1/2-inch intervals. (You should end up with five lengthwise strips 1 1/2 inches wide.) Now use your knife to cut diagonally across the strips at 1 1/2-inch intervals to form diamond shapes. You should end up with approximately 36 diamond-shaped pieces of baklava in the baking dish.
Bake the baklava until golden brown, about 40 minutes.
Using oven mitts or pot holders, remove the baklava from the oven and set aside on a wire rack to cool for 5 minutes. Using a ladle or small measuring cup, slowly drizzle the cooled syrup over the warm baklava. Allow to stand several hours before serving.
Yield: about thirty-six 1 1/2-inch pieces