If you cook these noodles ahead of time, make sure you rinse them well.
Combine first 6 ingredients in a small bowl; set aside.
Cook the sesame seeds in a small saucepan over medium heat 1 minute or until toasted.
Combine the sesame seeds, noodles, cucumber, and onions in a large bowl; toss mixture gently.
Divide noodle mixture evenly among 4 bowls; top with tofu and sauce.
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