Udon Bowl with Five Spice Slow Cooker Pork

Name: Udon Bowl with Five Spice Slow Cooker Pork
Ingredients: 2 lbs (900g) pork shoulder; 1 tsp five spice powder; pinch of kosher salt; 2 cups (480ml) chicken broth; 1 cup (240ml) water; 1/4 cup (60ml) soy sauce; 8 cloves of garlic; 1 piece (1-inch) ginger (sliced); 2 cups (480ml) chicken stock; 2 cups (480ml) water; 7 oz (200g) dry udon noodles; 1 TBS white miso paste (shiro miso); 1 tsp garlic powder; salt to taste; 1/2 tsp ground white pepper (optional); 1 stalk of green onion (chopped)