Prep the base: Line an 8x8-inch pan with parchment. In a bowl, mix crushed graham crackers, coconut, and melted butter until well combined. Press into the bottom of the pan to form a firm layer. Chill for 15 minutes.
Make the curd: In a medium saucepan over medium heat, whisk together sweetened condensed milk, egg yolks, pineapple juice, and lime zest. Cook, stirring constantly, until thickened (about 7–10 minutes).
Add pineapple: Fold in the crushed pineapple, then pour the mixture over the chilled crust. Smooth the top.
Chill time: Refrigerate for at least 4 hours, or overnight, until fully set.
Serve: Lift out using the parchment, slice into bars, and enjoy your tropical getaway!