Step 1

Put the potato and sweet potato in a saucepan and cover with water.

Step 2

Bring to the boil and simmer until just softening.

Step 3

Add the cabbage and leeks to the pan, stir well and boil for 2 minutes more until the leeks are just softening.

Step 4

Drain well and return to the pan. Put over a low heat, stirring and mashing together to dry out any excess moisture.

Step 5

Cool. Season well.

Step 6

Shape into 4 patties and coat with panko breadcrumbs.

Step 7

Heat the olive oil and fry on each side for about 4 minutes, until golden brown.