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Bring a large pot of salted water to boil. Bring 1 TBSP butter to room temperature. Wash and dry all produce. Peel and halve carrot lengthwise; thinly slice crosswise. Halve, peel, and dice onion. Trim, then thinly slice scallions, separating whites from greens. Mince 1 clove garlic. Drain beans.