Bring a large pot of water to a boil. Add sea beans; cook 30 seconds. Drain and plunge sea beans into a large bowl of ice water. Drain and pat dry.
Heat a large skillet over medium-high. Add oil; swirl to coat. Add onion; sauté 2 to 3 minutes or until crisp-tender but still vibrant in color. Add sea beans; cook 1 minute or just until warm.
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