Arrange a long sheet of aluminum foil on a clean work surface.
Dollop the refried beans onto the center of the foil and using the back of a spoon, spread the refried beans into a circle, creating the base of your nachos. Make sure this isn't too big as you need to fold the foil up around the pile of chips.
Once the base is make, add a thin layer of tortilla chips.
Top the layer with thin slices of hte carne asada, cheese, and black beans.
Repeat for two or three more layers, making sure the top layer has extra cheese.
Fold the long ends up the foil up over the chips carefully, as to not break the chips, and pinch the edges shut.
Carefully place the foil packet over indirect heat and allow the nachos to cook, so the cheese melted through on every layer, checking every 7 minutes or so depending on the heat of your fire.
Once the cheese has melted through, carefully remvoe the foil pack nachos from the campfire and open the packet.
Using a variety of topping, cover the top of your nachos with sliced avocado, scallions, sliced jalapeno, red onion, and sweet peppers.
Serve liquid items like sour cream, guacamole or salsa on the side to prevent soggy chips.
Garnish with cilantro and crema if desired.