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)
After making a hotpot or a nabe, you always have leftover broth. This is excellent, as it has all the taste from the previous ingredients, so never waste this - let's cook a whole onion in it!