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Place potatoes in large saucepan and fill with water until potatoes are covered. Bring to a boil, reduce heat to medium and simmer until potatoes are tender (~ 10 minutes).
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Drain, rinse under cold water and refrigerate to cool.
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Place green beans in large saucepan and fill with water until beans are covered. Bring to a boil, reduce heat to medium and simmer until beans are somewhat tender and still bright green (do not overcook).
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Drain and transfer to large bowl.
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In small bowl, combine olive oil, vinegar, and mustard and mix thoroughly.
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Slice potatoes into quarters and place in the bowl with the green beans.
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Drizzle vinaigrette over the mixture and toss until all potatoes and beans are well coated. Add salt and pepper to taste.