mix sugar, flour, salt, sour cream, and cream cheese in mixing bowl until just consistent
add in the eggs, one at a time, scraping the sides to make sure it is even
add the lemon zest, lemon juice, and vanilla, then mix until smooth, but don't overdo it
pour filling into spring-form pan. Mixture should come up to the top of the graham cracker crust, but it is fine if it goes over.
place spring-form pan in water-filled broiler pan and cook for 90 minutes.
turn the oven off and open the door slightly. Let the oven and cake cool for 15 minutes, then remove the broiler pan with the spring-form pan in it and let it cool on a rack for 30 minutes.
take the spring-form pan out of the broiler pan and remove the aluminum foil. If the filling was over the top of the crust, take a butter knife or a frosting knife and run it around the edges (don't scratch the pan).
cover the top of the spring-form pan with plastic wrap, and refrigerate overnight.
remove from the refrigerator and place on a serving plate. Carefully remove the spring-form.
evenly pour Cherry Topping over cheesecake. Cut with a wet, sharp knife and serve.