At home, combine all the BBQ sauce ingredients in a small sealable container and pack it in your cooler.
In camp, drain the jackfruit and using clean hands, shred the pieces, removing any tough bits. Dice the onion.
Heat the oil in a skillet over medium heat and add the jackfruit and onion. Sauté until it begins to turn golden, then add ½ teaspoon salt. Cook until the jackfruit begins to brown on the edges, then add the BBQ sauce to the skillet and toss to coat.
To assemble, divide the jackfruit filling between the two sandwich buns, then top with the slaw and cilantro.