Place walnuts and in a food processor. Sprinkle with cinnamon and blend until nuts are coarsely chopped (I prefer to chop them on the smaller side). Add the sugar and mix thoroughly.
Melt butter. rease bottom of a 9 X 13” baking dish. Lay 8 sheets of filo one at a time while buttering between each sheet.
Sprinkle 3 -4 tablespoons of nut mixture covering the entire surface of the baking dish. Cover with two more sheets of buttered filo dough. Repeat until you run out of nut mixture.
Lay last 8 remaining sheets of filo one at a time while you butter between each sheet. Pour remaining melted butter making sure the last layer is well buttered.
Score the top of the baklava into the slices that you like. I usually do 1 inch squares or triangles. Bake for 45 -50 min or until the top has turned a nice golden brown. Finally, 10 minutes before the Baklava is done, take it out of the oven and sprinkle top with water. You will hear it sizzle as you do this (this makes it crispy). Place back in oven for the remaining 10 minutes. Let cool completely before applying the syrup.