Heat 1 tablespoon neutral oil in a large pot over medium heat. Add the ground chicken and cook for 10 to 15 minutes, breaking it up as it cooks, until browned and cooked through. Season with 1 teaspoon salt.
Add the aromatics:
Add the minced white parts of the scallions, garlic, and ginger to the chicken. Drizzle the sesame oil on top. Cook for 2 minutes.
Add the sliced onion and grated carrots. Cook for 5 to 7 minutes until the onion softens.
Sprinkle the dashi granules on top and pour in the chicken broth. Bring to a boil.
Simmer the soup:
Reduce the heat to low and simmer for 20 to 30 minutes.
Cook the udon:
Bring a large pot of water to a boil. Add the udon and cook according to the package directions. Drain, rinse, and divide between four bowls.
Finish the soup:
Add the tamari, mirin, and kale to the soup. Simmer for 5 minutes until the kale is bright green and tender. Taste and adjust the seasonings to your preference. Turn off the heat.
To serve:
Ladle the soup over the noodles. Garnish with the minced green parts of the scallions. Finish with ume shiso furikake or your favorite furikake or a sprinkle of sesame seeds if you like. Enjoy!