First cook your pasta according to the packet instructions, this usually takes between 9-11 minutes.
While the pasta is cooking, add the fish stock cube and stock pot to the water and set aside.
Spray a pan with some low-calorie cooking spray then sauté the onions for about 5 minutes, until they are softening. Pour in the stock, then add the salmon, asparagus, parsley and lemon juice. Cover and cook for 5 minutes.
While the salmon and pasta are cooking, whisk together the egg, egg yolk and quark until smooth.
Drain the pasta and return it to the pan, then quickly stir in the egg mixture. Beat well until it's a smooth consistency, then add the salmon, asparagus and stock mixture. Mix well then stir in half of the pecorino and season to taste with a little black pepper.
Serve sprinkled with the remaining pecorino and a little extra chopped parsley, if you’d like.