Heat the coconut oil in a large pot over a medium-high heat. If using coconut oil, let it completely melt. Add 3 or 4 popcorn kernels and put the lid on the pot.

When the kernels start to pop, pour in the rest of the kernels and put the top on again. Swirl the kernels around so that they get coated in oil. Let the popcorn start popping and shake it occasionally to allow the un-popped kernels to sink to the bottom.

While you wait for the popcorn to pop, combine the melted butter and mayonnaise in a small bowl and whisk to combine.

The popcorn is done popping when there is about 1 second between pops.

Dump the popcorn into a large bowl and pour the lime zest, chili powder, and salt on top. Mix gently, just to spread out the toppings a little bit.

Pour the butter and mayonnaise mixture on top and then stir well, I just used my hands, to make sure everything is well coated.