Place a large pot over medium heat and add the broth ingredients. Bring to a simmer and cover with a lid. Leave to simmer for 30 minutes. Alternatively, complete this step in an instant pot using the "Soup" setting.
2 onions, 1 stick celery, 1 carrot, 4 cloves garlic, 2 teaspoon black peppercorns, 1 teaspoon sea salt, 1 stock cube, small bunch of parsley, 2 litres boiling water
Remove the lid and strain the broth into another pan or a bowl, so you have a smooth golden liquid.
To Make the Soup
Return the large pot to a medium heat and add the strained broth.
Add the pasta and cook for 5 minutes. While the pasta cooks, use a fork to shred the king oyster mushrooms and finely chop the caps.
120 g pasta, 4 king oyster mushrooms
Add the carrot, celery and shredded mushrooms to the broth and simmer until the vegetables and pasta are just cooked (around 5-6 minutes).
2 carrots, 2 sticks celery
Add the dill then season to taste with salt and fresh pepper before serving.