Method
Cook the spaghetti in boiling salted water as instructions on pack and while this is cooking take a frying pan sprayed with oil and fry the bacon and mushrooms together until cooked through.
Place the quark and eggs into a large jug and whisk together thoroughly (takes a little time but it does become smooth after a few minutes). Add 1 tsp pepper and 1/2 tsp salt and whisk again.
Once cooked , Drain the spaghetti in a colander ( PLEASE remember to keep back a cup of the water the pasta was cooked in). Place the drained spaghetti back in the saucepan and add everything else in, The egg mixture, the cupful of pasta water and the bacon and mushrooms and mix everything together really well for a few minutes.
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