While the salmon cooks, put your deputy in charge of this dish. Blanch sprouts in boiling salted water 1 minute. Drain; cool in a bowl of ice water. Spin dry, covered with a paper towel.
In a bowl, whisk chopped green onion, garlic, oil, salt, and pepper. Add sprouts; gently toss. Season with salt and pepper and top with sliced green onion.