I wanted to make small röstis to serve under meat patties. But so often they tend to fall apart in the pan! So I had a flash of inspiration, and added a stiffly whipped egg white to grated potato. Obviously you can add finely chopped onion, spring onion, garlic, pepper and parsley, or whatever else you wish to this mixture. This is just the basic, simple mixture I came up with, and it worked like a charm: perfect little flattish cakes which had NO chance of falling apart! They puff slightly but sinks again, but your little rösti will NOT fall apart no matter what kind of potato you're using!