Thoroughly wash the arugula and pat it dry with paper towels. Then, finely chop it. Grate the Parmesan cheese and press the garlic through a garlic press.
In a bowl, combine the ricotta, arugula, half of the grated Parmesan, garlic, salt, pepper, and a pinch of nutmeg. Tip: If the mixture is too thick, add 1-2 tbsp of heavy cream.
Fill the cannelloni pasta tubes with the arugula-ricotta filling. You can use a pastry bag or a small spoon to carefully fill them.
In a small saucepan, melt the butter, add the heavy cream, and bring to a simmer. Add the remaining grated Parmesan and cook for a few minutes, until slightly thickened.
Grease a baking dish, then arrange the filled cannelloni in it. Pour the Parmesan cream sauce over them evenly.
Cover with aluminum foil and bake in a preheated oven at 350°F (180°C) for 25 minutes. Then remove the foil and bake for another 10 minutes, until golden brown on top.
After baking, let it rest for at least 5 minutes before serving. Sprinkle with freshly grated Parmesan or extra finely chopped arugula before serving.
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