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Combine Dijon mustard, lemon juice, garlic, olive oil, red pepper flakes, salt, and pepper in a 16 ounce (pint) jar (I use Ball canning jars, but any jar will do).
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Shake jar until dressing well combined.
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Fill a large jar first with the beans.
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Add the dressing.
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Place the salad greens into the jar.
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Sprinkle the grated parmesan cheese on top of the greens.
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Cover tightly and refrigerate
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When ready to eat the salad, shake the jar to combine and then pour into a serving bowl.
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Toss a few times to fully combine.
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Add the croutons on the top.
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Serve and enjoy.