Bring a large pot of salted water to a rolling boil and cook the wheat noodles according to package directions until just tender. I set a timer for two minutes before the package says done because cold sesame noodles crowd summer recipe needs noodles that have some structure left in them—overcooked noodles turn mushy when they cool down. Drain immediately and rinse under cold water until completely cool to the touch, which takes about three minutes.
While the noodles cook, whisk together sesame paste, soy sauce, rice vinegar, sugar, and minced garlic in a medium bowl using a fork. The sesame paste will resist at first and clump up—keep whisking steadily because it wants to break down and become smooth. This step matters because you're emulsifying the sauce so it coats evenly rather than pooling at the bottom of the bowl.
Once the dressing reaches a pourable consistency, drizzle in the chili oil and olive oil while whisking constantly to incorporate them into the sauce. You'll see it transform from thick paste to silky coating that looks almost golden as it comes together. This is honestly my favorite moment in the entire recipe because you can taste it at this stage and adjust seasoning before the noodles go in.
Place the cooled noodles in a large mixing bowl and pour the dressing over top, then toss gently but thoroughly for about two minutes using two forks. Every noodle strand should glisten with sauce—this is where most people ruin cold sesame noodles crowd summer recipe by rushing and only mixing the top layer. I make myself count to 120 while tossing because it's worth the extra effort.
Fold in the chopped cilantro and peanuts gently so they stay evenly distributed throughout rather than settling to the bottom where nobody finds them. Taste one noodle here and adjust salt or lime juice if needed—the flavors settle as things chill, so slightly overseasoning now keeps everything tasting bright later.
Divide the noodles among four bowls or a large serving platter and top each portion with sliced cucumber right before serving. The cucumber stays crisp because it hasn't had time to weep into the warm noodles, and this timing detail keeps everyone raves pasta energy alive even on the hottest days. Drizzle any remaining dressing over the top and serve at room temperature or chilled—both work beautifully.