Oyster mushrooms, ginger and scallions season this vegetable-broth ramen. Measure the mushrooms by the listed cup quantity rather than the inconsistent ounce conversion. Cook the noodles according to their package and add the bok choy where it can simmer without being buried under a dry noodle block. Start with four cups of broth and keep the fifth cup nearby for adjusting the finished soup. The noodle quantity is 125 grams dry, not two unspecified packets; packet weights differ. Use the noodle manufacturer’s cooking time and leave out seasoning sachets when using this broth formula. Separate thick bok choy stems from tender leaves if their sizes differ substantially, adding the leaves later. The Sriracha and gochujang options have different sweetness, heat and thickness, so choose one listed option rather than adding both. Check that noodles, broth and prepared toppings suit a vegan diet. Serve promptly, since noodles continue absorbing broth as they stand.