1 - STEP 1 Before you start, put your oven on its lowest setting, ready to keep things warm.

2 - Peel the potatoes, grate 2 of them, then set aside.

3 - Cut the other 2 into large chunks, then boil for 10-15 mins or until tender.

4 - Meanwhile, squeeze as much of the liquid from the grated potatoes as you can using a clean tea towel.

5 - Mash the boiled potatoes, then mix with the grated potato, spring onions and flour.