Authentic Middle Eastern Walnut Baklava

Name: Authentic Middle Eastern Walnut Baklava
Ingredients: 2 small eggs ((lightly whisked)); 1 cup milk (at room temperature) ((237 ml)); ½ cup vegetable oil ((115 ml)); 1 tbsp yogurt; 2 tbsp white wine vinegar; 1 TSP baking powder; 1 pinch salt; 5 cups strong white flour ((600 grams)); 4 cups water ((900 ml)); 4 cups sugar ((900 grams)); few drops of lemon juice; 13 oz chopped walnuts (for filling between filo pastries) ((350 grams)); 1½ cups corn or wheat starch (for rolling out the filo pastries) ((200 grams)); 6½ oz clarified butter (about 1¾ sticks) ((210 ml)); ½ cup vegetable oil or sunflower oil ((115 ml))