I want to make an authentic soba noodle using a proper dashi stock with bonito (katsuobushi) and kombu seaweed, but here in the UK, there is no katsuobushi as it is not allowed to be imported from Japan. And bonito flakes are very expensive, so I thought I'd try using mentsuyu (noodle broth).
Your favourite vegetables, Vegetable oil, Soba noodles, Hot water, Mentsuyu (concentrated)