Put water in the water tank.
 

Wash the potatoes well and then slice each into eight wedges.
Place in a sealed plastic bag, add in some Vegetable Oil and shake until both sides are coated.
 

Line the Baking tray with aluminum foil and place the potatoes (step 2)  on it, make sure they don't overlap.

Select MANUAL COOK, choose WATER OVEN, then press ENTER.

Select 1 TRAY, NO PREHEAT, press ENTER.

Choose 250°C, then press ENTER.

Set the knob about 22 - 25 minutes and press START.

Coat with salt immediately after cooking.
＊Add butter when they are freshly cooked dishes more tasty.