INGREDIENTS
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1 tablespoon olive oil, divided
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1 (10-ounce) bag baby spinach, chopped
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3 garlic cloves, minced
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3 vertically sliced shallots
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1 tablespoon chopped fresh sage
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3/4 teaspoon chopped thyme, divided
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1/2 teaspoon black pepper, divided
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1/4 teaspoon salt
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1 (8-ounce) package cremini mushrooms, quartered
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3/4 cup toasted walnuts, chopped and divided
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2 tablespoons red wine vinegar
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2 ounces shredded Gruyere cheese
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8 cups water
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2 tablespoons white vinegar
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4 large eggs