Prepare the flavor base by combining curry paste, garlic, ginger, parsley, tahini, and soy sauce in a large heatproof bowl.
Heat the hot oil in a small pan until shimmering, then carefully pour over the flavor base mixture. Stir well until smooth and aromatic.
Boil noodles in a large pot according to package instructions.
Add bok choy to the noodles during the last 2 minutes to blanch.
Remove noodles and bok choy using tongs or a slotted spoon; reserve the cooking water.
Cook the gyoza dumplings in the same boiling water or a separate pot for 5–7 minutes or according to package instructions. Drain and set aside.
Gradually whisk the reserved noodle cooking water into the flavor base to create a rich broth. Adjust seasoning with salt or chili flakes as desired.
Divide noodles, bok choy, and gyoza among serving bowls.
Pour the broth over the ingredients.
Garnish with scallions, sesame seeds, and a drizzle of chili oil or chili crisp.
Serve with lime wedges and nori sheets if desired.
Serve immediately while hot.