Drain and rinse the can of jackfruit using a strainer. Use your fingers to pull the jackfruit apart, making it stringy.
Jackfruit Marinade: In a medium sized bowl combine red wine, liquid aminos, liquid smoke, and jackfruit and let marinade for a minimum of 20-30 minutes.
Sauté onions in a drizzle of oil on medium-low heat until onions become transparent. Remove onions and set aside.
In large pot on medium heat, drizzle oil and sauté mushrooms until softened, 5-10 minutes.
Add in vegetable broth, miso, the jackfruit with the marinade liquid, garlic powder, onion powder, and smoked paprika. Cover with a lid and simmer gently for 10-15 minutes, until mushrooms are tender.
Turn off heat. Use a colander and another large pot to carefully separate and save the liquids, then add mushroom mix back to the pot. Stir in spinach and bell pepper.
For garlic aioli: mince 1 garlic clove and place in a small bowl. Add in 2 Tbsp vegan mayo and stir to combine.
Lightly toast baguettes. Top with garlic aioli, dijon mustard, and fill sandwiches with mushroom and jackfruit filling and onion rounds. Pour au jus in small bowls for dipping. Enjoy!