Microwave the swede for 2-3 minutes, or until tender.
Stir fry all ingredients (apart from egg) together for 5 minutes
Put in a bowl and mix in the beaten egg. At this stage you can add optional extras, cheese, cream, chorizo, bacon.
Form in to patties and fry in butter until crisp. For a less calorific option bake in the oven until crisp.