Cook spaghetti in boiling, salted water until al dente. When noodles have about 1 minute left to cook, add sliced snow peas to the pot to blanche. Drain, rinse under cold water and let drain well.
Meanwhile, fit food processor with chopping blade. With motor running, drop garlic cloves and ginger into bowl to mince finely. Stop motor and add brown sugar, peanut butter, rice vinegar, soy sauce, sesame oil, chile paste and hot water to garlic and ginger. Blend until smooth.
When noodles are cold, combine noodles, vegetables and dressing until well coated. Serve at room temperature or chilled. Garnish with toasted sesame seeds if desired. Feel free to substitute other favorite veggies if desired.