Just 15 minutes after the very first Cheesecake Factory opened in Beverly Hills back in 1978, the lines began forming. Here's their cheesecake twist on the delicious Key lime pie. Since Key limes and Key lime juice can be hard to find, this recipe uses standard lime juice which can be purchased bottled or squeezed fresh. If you can find Key lime juice, bear in mind that Key limes are more tart, and use only half as much juice. This recipe also requires a springform pan. If you don't have one, you can use two 9-inch pie pans and make two smaller cheesecakes.