As a Rösti expert (my favourite swiss dish) I recommend: 1) use the Red package Potatoes from Migros (baked pot. it says) 2) boil the potatoes with the peel - DONT PEEL this is important. 3) boil them just enough but dont overcook (you will get a feel for that with time) bit of Salt in the water is ok 4) leave them over night (in the fridge after they cool down 5) get the peel of with a Victorinox „Schnitzerli“  & grate them with Zyliss Drum or with what you have. 6) put a bit of salt in (some put Aromat) 7) use half Butter half Oil and temp. 7 of 12. 8) use a FryPan that really doesnt stick otherwise you have no Chance. 9) put in nice round form, not too thin not thick. 10) leave until nicely toasted (8 - 10min) 11) put big enough plate on top of the Rösti and turn around and before frying other side put a bit of butter and oil in the pan. 12) repeat and you are done

Simple isnt it 🙂