INGREDIENTS
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1 medium shallot, thinly sliced
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1/4 cup white wine vinegar
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1/4 teaspoon crushed red chile flakes
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1/2 teaspoon sugar, plus more
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Kosher salt
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8 ounces thick-cut bacon, cut into 1/2-inch pieces
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1 pound shiitake mushrooms, stemmed, large caps torn into 1-inch pieces, small caps left whole
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1 garlic clove, smashed
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Freshly ground black pepper
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1/2 cup buttermilk
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1/2 cup sour cream
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1/4 cup mayonnaise
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1 tablespoon fresh lemon juice
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1/2 teaspoon garlic powder
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1/2 teaspoon onion powder
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1/4 cup finely chopped mixed herbs, such as basil, chives, and/or dill
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2 large bunches mature spinach, stemmed, torn into 2-inch pieces