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1
Bring dashi to simmer in a large heavy-bottomed pot over medium heat; add squash, carrots, daikon, and mushrooms; simmer 12 minutes until vegetables soften.
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2
Dissolve red miso in a small bowl with 80 ml warm dashi; stir back into pot along with mirin and minced garlic; adjust seasoning with salt.
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3
Add fresh udon noodles and cook 3–4 minutes (or 5–6 minutes if using dried cooked udon).
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4
Scatter ginger julienne and scallions into pot; simmer 1 minute until aromatics bloom.
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5
Taste broth and adjust miso/salt balance; divide noodles and vegetables evenly among four bowls.
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6
Ladle hot broth over each bowl to cover noodles completely; serve immediately.