I am a former PF Chang's bartender, here it is.
1.5 oz Licor 43 (find it at a liquor store or BevMo)
1 oz Key Lime Juice (Also at BevMo)
Squirt of Simple Syrup
1 oz of Half and Half
Throw it all in a shaker with ice. Add whipped cream in the shaker, just ring
the inside about 3 times quickly.
Shake (3 shakes will do) and strain into a martini glass rimmed with graham
cracker crust.
Enjoy.