Place the coconut oil in a large, heavy pot with a tight-fitting lid. Melt over medium-low heat. Add three "test" popcorn kernels, and cover. Shake the pot to coat the kernels in oil, and cook, shaking every few seconds, until all three kernels pop. Remove from heat and remove and discard the three popped kernels. Add the remaining popcorn to the pot and cover. Cook, shaking the pot back and forth every few seconds, until the popcorn has mostly finished popping (you'll know when it's done when more than three seconds go by without hearing a "pop".) Remove from heat and transfer to a large bowl. Sprinkle with salt, and enjoy!