Bring 6 quarts water to boil, salt water, and cook noodles to package directions. Drain and cold shock the noodles, then dress lightly with peanut oil.
In a large bowl, combine sesame paste and peanut butter and thin mixture with hot water using a whisk, then stir in soy sauce, vinegar, sesame oil, sugar, garlic, ginger, and hot sauce, if using. Toss the noodles with sauce to coat evenly, then top with garnishes and serve.