2 teaspoons dry mustard powder (such as Coleman's®)
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1.5 teaspoons cold water
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1.5 tablespoons white vinegar
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1 tablespoon soy sauce
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1 tablespoon sesame oil
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1 tablespoon sesame seeds
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1 teaspoon white sugar
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1 teaspoon salt
Instructions
Bring a large pot of lightly salted water to a boil. Add green beans and cook uncovered until bright green, about 3 minutes. Drain in a colander and immediately immerse in ice water for several minutes to stop the cooking process. Drain and transfer to a large bowl.
Mix mustard powder and cold water together in a small bowl to make a paste. Stir in vinegar, soy sauce, sesame oil, sesame seeds, sugar, and salt.
Pour mustard paste mixture over green beans; toss to coat. Chill for at least 30 minutes before serving.