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In a large saucepan, heat oil over medium-high heat. Add mushrooms and sauté for 3 - 4 minutes.
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Add chicken broth and soy sauce. Cook until liquid is absorbed in mushrooms.
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Remove from heat and add vinegar, salt, pepper and hot sauce. Transfer to a small bowl, set aside and allow to cool.
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In the same pan over medium-high heat, add 1 teaspoon of olive oil. Add pancetta and cook for 2 minutes.
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Add red onion and cook for another 2 minutes or until onion is softened and pancetta has crisp to your liking.
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Transfer the onion and pancetta to the bowl with mushrooms and gently mix well.
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In a large bowl add baby spinach and mushroom, pancetta, onion mixture. Gently toss together.
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Lightly dress salad with balsamic vinaigrette and toss gently.
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Top with Parmesan cheese shavings on individual servings if desired. Serve immediately.