Wipe the mushrooms clean with a damp cloth. Remove the stems and finely chop them. Preheat the oven to 400 degrees F. In a large mixing bowl, combine the ground meat, fennel seed, onion, garlic, lemon zest, half of the cheese, the chopped mushroom stems, breadcrumbs and spinach and season with salt and pepper. Brush lightly with EVOO and stuff the mixture into the caps.
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