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In a saucepan or cast iron pan toast the walnuts for about 10 minutes.
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For the pickled shallots, combine the vinegar, maple syrup, and 3/4 teaspoon salt in a small saucepan over medium heat, bring it to a simmer, remove from heat and add the shallots. Set aside to cool and marinate about 20 minutes.
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Combine all the greens in a large bowl. Remove the shallot from the pickling liquid and add to the greens, along with the toasted walnuts.
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Whisk the sour cream, olive oil, and mustard into the pickling liquid. Drizzle over the salad and season with salt and pepper to taste.