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In a large pot, bring 6 cups of salted water to a boil. Separately, combine 1 cup of ice and 3 cups of water in a large bowl or pot and set aside.
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Trim the ends of beans (the skinny, tapered ends) with kitchen shears or a knife. Wash the beans thoroughly.
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Add green beans to boiling water and cook uncovered for 3 minutes. Drain beans and immediately transfer them to the ice water bowl and leave for 5 minutes. The ice bath helps stop the cooking process.
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In the meantime, prepare the sauce. In a small bowl, mix Dijon mustard, olive oil, water, and minced garlic.
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Drain beans and toss in Dijon mustard sauce.
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Keep in the fridge in an airtight container for up 3 days.