1. Preheat the oven to 400 degrees F. Remove the stems from the cremini and save for another use. Sprinkle the caps inside and out with salt and place stemmed-side up in a small baking dish; caps should be touching.
2. Use a fork to mash the butter with the parsley, garlic, and anchovy paste until smooth. Stuff each cap with some of the butter. Drizzle the olive oil over the mushrooms and bake until the mushrooms are tender and the butter has melted, about 20 minutes. Sprinkle with lemon zest and pepper over the top. Serve with crusty bread.
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