Preheat the coconut oil in a nonstick pan over medium heat.
Remove the peels from the plantains and cut the plantains into 1 inch thick slices.
Cook the plantains over medium heat for about 2 minutes per side.
Reduce the heat to low or medium low and cook for 10-15 minutes, flipping occasionally. If the plantains start to get too crispy you can add 1/4 cup water to the pan to rehydrate them. As the plantains cook, you can move on to shape the arepas.
Arepas
Preheat the oven to 350 degrees.
Mix together all of the ingredients for the arepa dough then separate the dough into 4 equally sized balls. Press the balls into disks that are between 1/2 inch and 1 inch thick.If the disks crumble around the edges as you shape them you can wet your hand and smooth the edges with your fingers.
Preheat a flat nonstick pan or griddle over medium heat. Cook the arepas for 3-6 minute on each side or until they start to brown.
Put the arepas on a baking sheet lined with parchment paper and cook the arepas for an additional 10 minutes at 350 degrees.
Assembling the sandwich arepas
Mash the avocado with a fork.
After the arepas have cooled, cut the arepas in half so that you have 2 thin disks.
Add the mashed avocado, fried sweet plantains, kidney beans, and hot sauce to the lower half of the arepa then put the upper half of the arepa on top of it to form a sandwich.