- 1 pound fresh green beans, trimmed
- 2 teaspoons dry mustard powder (such as Coleman's®)
- 1 1/2 teaspoons cold water
- 1 1/2 tablespoons white vinegar
- 1 tablespoon soy sauce
- 1 tablespoon sesame oil
- 1 tablespoon sesame seeds
- 1 teaspoon white sugar
- 1 teaspoon salt
- 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.