Since Kartoffelbrei (potato pancakes) is a German specialty, I somehow doubt that Jane Austen would have eaten these. That said, they’re good.
Grate each coarsely and mix them. You’re aiming for roughly equal portions of each vegetable so adjust accordingly if you have a huge potato and a tiny parsnip.
add and mix
1 tablespoon flour
1/2 tsp salt
pinch of pepper.
Fry in a layer of hot oil, browning both sides. Remove, drain and eat. The picture had to be taken quickly as they went even faster.