Cut snow peas on diagonal into long thin slices. Set up a large bowl of ice and cold water.
Blanch snow peas 30 seconds in a large pot of boiling, lightly salted water. Drain in a colander. Immediately transfer to ice water to stop cooking. Drain well.
In a bowl toss snow peas with oil, green onion and sesame seeds. Season to taste with salt and pepper.
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