Cook noodles in well-salted boiling water until just al dente. Drain and rinse thoroughly under cold water until completely cool. Toss immediately with 1 tablespoon sesame oil.
Whisk together peanut butter, soy sauce, sesame oil, rice vinegar, honey, lime juice, garlic, ginger, and sriracha. Add warm water one tablespoon at a time until smooth and pourable. Taste and adjust seasoning.
Slice all vegetables thinly — bell peppers and cucumber into matchsticks, carrot julienned, cabbage shredded. Slice green onions.
Pour three-quarters of the sauce over the noodles and toss to coat. Add all the vegetables and toss again until evenly combined.
Cover and refrigerate for at least 20 minutes.
Before serving, add reserved sauce and toss again. Divide into bowls and top with sesame seeds, chopped peanuts, and fresh cilantro. Serve with lime wedges and extra sriracha.
Notes
Salt the cooking water generously for well-flavored noodles
Rinse noodles until completely cold to stop cooking and prevent clumping
Toss with sesame oil immediately after draining to prevent sticking
Make the sauce first so flavors have time to meld
Always reserve a quarter of the sauce for refreshing leftovers
Taste and adjust the sauce before adding it to noodles
Cut all vegetables consistently thin for the best texture
Keeps in the fridge for up to 4 days — add reserved sauce before each serving
Add shredded chicken, crispy tofu, or a soft-boiled egg for extra protein
Use tamari and rice noodles for a fully gluten-free version