Put Graham Crackers (250 gram) into the food processor and crush up the cookie. Transfer the cookie crumb into a mixing bowl. Add Butter (100 gram) and stir it up until it has the consistency of wet sand.
Take a springform cake tin, lightly grease it with butter, and add some non-stick baking paper. Poor in the crumb mixture and use the base of a flat bottom glass to press the mixture down so it's flat and even. Put it in the fridge for about 10 to 15 minutes to chill.
Take a mixing bowl and add Cream Cheese (500 gram), Sweetened Condensed Milk (400 gram) and beat it until it's smooth. Next, add in the Lemon (1) Zest and juice. Gently pour a bit of the juice at a time as it mixes until it's all added in. Stop beating once it starts to thicken. Spoon the cream cheese mixture into the cake tin. Smooth the mixture out until it's flat and even. Then put it in the fridge for 6 hours. Serve and enjoy!