Grind the walnuts. Smear the bottom of an oven dish with oil, put a phyllo pastry sheet in it, sprinkle with a little oil and put the 2nd sheet, continue until you've used up half the sheets.
Distribute the ground walnuts and a little oil evenly. Continue stacking the rest of the sheets, with oil between them.
Bake in a low oven at 302°F (150 °C) until reddened. Then take the oven dish out and leave it to cool. Next, prepare the syrup.
Pour the water, sugar and 3 packets of vanilla in a pot. Stir and put the pot on the stove. The water needs to come to a boil.
Then turn the stove off and leave the syrup for 2-3 min. to settle. Pour it over the cooled baklava. Leave it to sit for 24 hours before serving.