Process the crust ingredients (coconut, pecans, dates, lime zest and sea salt) in a food processor or mini chopper until the dates have turned into sticky paste holding the crust ingredients together. Take mixture out of the processor and press evenly into your springform pan. Place pan in freezer while you make the tart filling.
While the crust is setting in the freezer, blend ingredients for the filling (avocados, lime juice, agave or maple syrup, coconut oil and lime zest) in a high-speed blender or food processor until creamy.
Pour the avocado filling over the crust and use a spoon to make sure the filling is even and smooth.
Place pan in the freezer to set up, at least 2 hours, but can be overnight. Take out of freezer, remove the springform pan, let sit out for 10-15 minutes, cut into slices and serve. The longer it sits out, the filling will soften and become more like pudding. It still tastes amazing, but not as firm. Store any leftovers back in the freezer.
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Notes
If you don't need this recipe to be vegan you can use honey for the sweetener in the filling.