Pour the flour into a mixing bowl, make a well in the center, and add the egg, oil, water, salt, and vinegar.: The initial mix should smell faintly of fresh flour and egg, with the vinegar adding no noticeable aroma but quietly improving texture. Use your fingertips to bring liquid toward the flour wall, feeling the dough begin to gather in the well. The tactile sensation helps you judge hydration; if the dough feels powdery, a touch more water will help, if it feels sticky, a light dusting of flour is the fix. Common mistake to avoid is dumping all liquid at once, which can make the center overly wet and hard to integrate evenly.
Combine the ingredients in the well and slowly draw in the flour, mixing with your fingers until a dough starts to form.: As you pull flour in, you should hear a faint rustle and feel the mixture change from loose to cohesive, like a soft crumble turning into a pliable mass. Work gently so you do not overwork the gluten; you want elasticity without toughness. If it feels gummy, it likely needs a light dusting of flour and more kneading time. Avoid using a mixer for this step unless you are experienced, because overmixing can yield a dense texture.
Form the dough into a ball and turn out onto a floured work surface. Knead the dough until you achieve a soft, elastic dough which is no longer sticky.: The kneading rhythm should feel almost meditative, press fold turn, press fold turn, and you will sense the dough smooth and spring back when pressed. The surface should become satiny, and small air bubbles might appear, indicating gluten development. If it resists stretching or tears, give it a few more minutes; if it becomes too tacky, add flour sparingly. A frequent error is adding too much flour too early, which makes the dough dry and hard to roll thin.
Put the dough back in the bowl and cover with a damp tea towel and rest on the sideboard for 30 minutes. Alternatively, flour the ball a little and drop it into a plastic freezer bag, give it a twist to get rid of the air, and leave it to rest for 30 minutes.: Resting relaxes the gluten, and you will notice the dough becomes easier to roll thin afterward. The scent should be neutral, and the surface slightly tacky but not wet. If you skip this rest, the dough will snap back when rolled and be difficult to shape. Avoid placing it in a drafty spot, which can form a dry skin on the dough.
While the dough is resting, preheat the oven to about 200-210 °C (392 – 410 ℉) (medium heat).: Preheating ensures the pie begins baking immediately and develops color evenly. When the oven reaches temperature, you might smell a clean warm air but nothing strong; a properly preheated oven reduces baking time variance. A common oversight is not preheating, which leads to uneven browning and longer bake times, so always allow the oven to reach temp before the pie goes in.
Now it’s time to start making the cheese filling. You should use about 500 g (1 lb) of cheese, but you can add more if you like a thicker layer of cheese in your pie (or indeed less, if you like it less cheesy). You can use different types of cheeses for this pie, from fresh cow's cheese to fresh or semi-aged sheep's milk cheese. You can also use Feta, goat cheese, Neuchâtel, paneer, or queso fresco.: Working with the cheese, you will notice textures vary wildly, from crumbly to creamy. Mash or break up firmer curds with a fork while keeping softer cheeses smooth. The aroma will be distinctly dairy, earthy, and slightly tangy for sheep or goat cheeses. Taste as you go; the saltiness varies. A pitfall is using extremely wet cheeses without compensating with binders, resulting in a runny filling, so add eggs and sour cream slowly to achieve the right body.
Combine the cheeses well, and break up the harder ones with a fork, then add sour cream or eggs, little by little, until you reach a nice sloppy consistency. I recommend adding the eggs/cream gradually: the amount you need will depend on the initial consistency of the cheese and the size of the eggs. The consistency you want is quite thick, certainly not ‘pourable’, but something like a thick cake batter or bricklaying mortar (if that helps you at all!). Taste it when you’ve done combining it and add salt if necessary.: the amount you need will depend on the initial consistency of the cheese and the size of the eggs. The consistency you want is quite thick, certainly not ‘pourable’, but something like a thick cake batter or bricklaying mortar (if that helps you at all!). Taste it when you’ve done combining it and add salt if necessary. : As you fold in eggs and sour cream, the mixture should become cohesive and glossy, with a faint tang and dairy sweetness. The sound here is quiet, just the scrape of spoon on bowl; the feel is dense yet yielding. If the filling separates or appears watery, you likely added too much liquid and should stir in more cheese or a beaten egg to firm it up. Avoid overbeating which can aerate the filling and change the texture when baked.
You’ll need to brush the sheets of dough with a little butter or oil. If you intend to use butter, now is the time to melt it in a pan over a very low heat.: Warm butter will smell nutty and sweet, especially if you brown it slightly, and it spreads easily across the pastry for even browning. Use a pastry brush to apply a thin, consistent layer; too much will make the dough greasy and heavy, too little will limit flakiness. A common mistake is brushing cold butter which clumps, so ensure it is fluid but not hot.
Once the dough is sufficiently rested, it’s time to roll it out. First of all, roll the dough into a sausage and cut into six equal parts. Form each sixth into a ball and then roll it out until it is the size and shape of the baking tray you intend to use (mine was a 25 cm/ 10-inch diameter circular tray, about 3 cm / 1 1/2 inches deep).: Rolling should feel even, with the dough thinning smoothly under the roller and whispering across the work surface. Keep the rolls relatively uniform so the layers bake evenly. If a sheet springs back, let it rest a minute and try again. A frequent misstep is over stretching a single sheet which tears, so patch carefully with a little dough and press to seal.
Butter or oil the bottom of the tray well, then put in the first sheet of dough. Brush it with butter/oil, then put in the second sheet, then half the cheese, spreading it out to about 1 cm (1/2 inch) from the edge of the tray. Then add another two sheets of dough (the first, again, brushed with butter/oil). Now add the rest of the cheese, again spreading it out until it’s about 1 cm (1/2 inch) shy of the edge of the tray. Finally, add the last two sheets of dough, brush each with butter/oil.: Building the pie is tactile and rhythmic, layering thin pastry and butter so that each layer crisps independently. The filling should be distributed evenly to avoid lumps that cause uneven baking. If you see gaps, gently press to close them, but don’t compress the layers too much or the pastry will not separate into distinct flakes. Avoid overfilling which leads to leakage and soggy edges.
Gently run the back of a knife over the top to mark the portions, dividing it into eight wedges (you could use a circular tray). You don’t need to cut through the dough, just depress it so that the cutting point will be more clearly defined at the end of the baking process.: Scoring creates visual guidance and helps steam escape so slices separate cleanly after baking. The top will be easier to portion if you press firmly but not deeply. If you cut through, juices may leak during baking, so resist the urge to slice all the way. A common slip is making uneven marks, which leads to inconsistent portion sizes.
Now, put the pie into the preheated oven and cook for about 20-30 minutes until the top has started to brown. At this point, make a mixture of one egg and three tablespoons of sour cream or yogurt, according to preference. Spread this mixture over the top of the pie and return it to the oven for another 15-20 minutes, or until once again brown. An egg beaten with one tablespoon of sour cream will help make the pie crust moist but still appealing and the sesame seeds work fine with the cheese.: During baking you will notice the top take on a warm golden hue and a faint, buttery aroma. Applying the egg and sour cream glaze mid bake gives the crust a glossy, tender finish and encourages deeper color without burning. Watch the edges closely; if they darken too fast, lower the oven shelf or cover loosely with foil. Avoid opening the oven repeatedly which can drop the temperature and extend bake time.
Once it’s nice and brown all over (but not burnt!) take it out of the oven, let it cool down for a few minutes, and then cut into portions using the lines you scored in it earlier.: Cooling allows the filling to set slightly so slices keep their shape. The aroma will be rich and inviting, and the top should crackle gently under a knife. If you cut too soon the filling may spill, yielding messy slices, so be patient for a few minutes to achieve tidy portions.
For the apple filling, start with grated apples, sautéed in a frying pan with some butter, sugar, and a cinnamon stick. The apples are ready when the apple juice is all evaporated; the point here is not to have any apple juice pouring around in the baking tray.: The apples will sizzle and soften, releasing a sweet perfume as the sugar caramelizes and the cinnamon infuses. Stir frequently so they brown evenly and the juices reduce to a thick jam like texture. If juice remains, the tray can become soggy, so cook until almost dry. Avoid high heat which burns the sugars and produces bitter notes.