Line or spray an 8x8 baking dish. Preheat your oven to 350℉.
Place your butter in a medium microwave safe mixing bowl. Warm in the microwave for 20 second intervals until completely melted.
Add your graham crumbs, ground pecans, brown sugar and salt to the melted butter and mix until combined. I find this easiest to mix with a fork.
Dump your graham mixture into your 8x8 pan and press down with your hand or the bottom of a measuring cup or glass until flat and even.
Bake in the oven for 10 minutes and then set aside to cool while you make your top layer.
In the bowl of a stand mixer fitted with a whisk attachment or a large mixing bowl, add your egg yolks and lime zest. Whisk on high speed for 5 minutes.
Add condensed milk and whisk for for additional 10 seconds on high.
Add in lime juice and whisk for additional 10 seconds on high.
Pour the egg mixture on top of your pre-baked base and place in the oven for 15-18 minutes. The centre should be just set with a slight jiggle.
Allow to cool in the pan for at least 30 minutes. Remove from pan, allow to cool to room temperature, at least 2 hours, slice and serve. I like to add a dollop of whipped cream when serving as well. Enjoy!