Roast pine nuts in a pan without additional fat until golden brown. Remove. Clean, wash and drain the arugula. Peel and finely dice shallots and garlic.
Heat the fat in a saucepan. Sauté shallots and garlic in it. Dust with flour and sauté briefly. Stir in a good 600 ml water and stock. Add cheese and melt in it. Season with salt and pepper.
Put a few leaves of rocket aside for garnishing. Add the rest to the soup. Bring everything to the boil again, cover and simmer for about 2 minutes.
Puree the soup with a hand blender. Pour in the cream. Season soup to taste with salt, pepper and nutmeg and serve. Sprinkle with pine nuts and garnish with remaining rocket.