In a small bowl, mix together soy sauce, mirin, and massaman curry paste until smooth. Set aside.
Add sesame oil to a nonstick skillet and heat it over medium heat. Add the jackfruit and cook it until browned and crispy around the edges, about 5 minutes. Take it out onto a plate and set it aside.
Add the onion and carrot, and cook for about 3 minutes. Add the cabbage and cook for another 2 minutes. Add the udon noodles, jackfruit, massaman curry sauce, and toss it so all the noodles are coated.
Plate it up and top it with some green onions and sesame seeds.