Baklava from the GBBO

Name: Baklava from the GBBO
Prep time: 3 h
Cook time: 1 h
Total time: 4 h
Cuisine: Middle Eastern
Ingredients: FILO DOUGH; 417 grams all-purpose flour; 1 2/3 tsp baking powder; 1/4 tsp salt; 2 medium eggs; 142 grams Full Fat Greek Yogurt; 42 grams butter, melted; 75 ml oil; 2 1/2 tsp white vinegar; 166 grams corn starch; SYRUP; 167 ml water; 112 grams granulated sugar; 250 grams honey; 1 medium lemon; 2 1/2 tsp vanilla extract; FILLING; 292 gram pecans, finely chopped; 292 grams pistachios, finely chopped; 42 grams granulated sugar; 2 1/2 tsp cinnamon; 2 1/2 tsp ground cardamom; 333 grams salted butter