Drain the jackfruit well in a wire mesh strainer, and squeeze it firmly to both get rid of extra brine, and also to pulverize the pieces of jackfruit into natural meaty bits.
Heat olive oil in a Dutch oven over medium heat. After 90 seconds, when the oil is hot, add the jackfruit in an even layer. Sauté for 7-8 minutes, until lightly golden all around.
Add the jalapeño, garlic, coriander, cumin, and oregano. Sauté for 2-3 more minutes to soften the jalapeños. Transfer the jackfruit mixture to a bowl and hold to the side until ready to finish the soup.
Heat olive oil for the soup in the same Dutch oven over medium heat. After 90 seconds, when the oil is hot, add the diced onion and sauté for 4-5 minutes until translucent.
Add the tomatillos and continue to sauté for 4-5 more minutes until they release their juices and begin to break down.
Add the hominy, pinto beans, cilantro, vegetable stock, agave nectar, lime juice, and salt. Bring to a steady simmer over medium heat, then reduce to medium-low heat and cook for 15 minutes, stirring every few minutes.
Remove about ¼ of the soup and transfer it to a blender. Blend until completely smooth, then return it to the pot and stir evenly.
Stir the cooked jackfruit into the soup.
Portion the pozole into bowl and serve hot, topped with cabbage, radishes, avocado, lime wedges, cilantro, white onion, and either sliced serrano or jalapeño.