Wrap foil around the lower exterior of a 9-inch springform pan (just to prevent any leaks). Preheat oven to 325°F.
In a large bowl, thoroughly combine graham cracker crumbs, sugar, melted butter, and salt. Dump the mixture into the prepared springform pan, pressing the mixture onto the bottom, and at least 1-inch up the sides. I like to use the bottom of a measuring cup to help firmly press the mixture in. Transfer the crust to the freezer while you prepare the filling.
In a food processor*, combine yogurt, cream cheese, eggs, sugar, flour, vanilla, and lemon zest. Process until creamy and completely smooth. be sure to stop and crape down the sides and bottom a few times as needed.
Pour the batter into the crust and smooth the top. Bake in the center of the oven for 45-55 minutes, until the cheesecake is just set around the edges and the center still has very slight jiggle. Place the pan on a wire rack to cool to room temp, then move it to the refrigerator until completely chilled (several hours). Serve with any of the toppings suggested. Store in the refrigerator.
