INGREDIENTS
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1 lb boneless, skinless chicken breasts
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Salt and freshly ground black pepper
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2 1/2 Tbsp olive oil, divided
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1 1/2 cups chopped carrots (about 3 large)
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1 1/2 cups chopped celery (about 3 stalks)
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1 1/2 cups chopped yellow onion (1 medium)
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5 cloves garlic, minced
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7 cups chicken broth
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1 1/2 tsp dried oregano
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1/2 tsp each dried basil, dried thyme, and dried rosemary
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1 cup (5.8 oz) dried orzo pasta
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1 parmesan rind, plus shredded parmesan for serving
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1 1/2 tsp lemon zest
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1/3 cup fresh lemon juice
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5 oz (5 packed cups) fresh spinach, roughly chopped