Add the sesame seeds to a small dry skillet over medium-high heat and toast until browned, about 2 minutes, stirring often to prevent burning. Transfer to a small dish and set aside.
Add the carrots, 1/2 cup water, hoisin, butter and some salt and pepper to a large skillet over medium-high heat and simmer for 3 minutes. Lower the heat to medium, cover and cook until the carrots are tender when pierced easily with a fork, about 20 minutes. Raise the heat to medium-high, bring to a simmer and cook, uncovered, until the liquid is reduced to a glaze, up to 2 minutes. Remove the pan from the heat, fold in the scallions and sesame seeds and toss until all is coated in the glaze. Serve warm.
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