Homemade Shiro Dashi

Bahan-bahan (1 porsi)

• 1 piece kombu (dried kelp) ((5 g; 2 x 2 inches, 5 x 5 cm per piece))
• 2 cups water
• 2 Tbsp usukuchi (light-colored) soy sauce
• ⅓ cup mirin
• 1 Tbsp Diamond Crystal kosher salt
• ⅔ oz katsuobushi (dried bonito flakes)