I never parboil my home made potato wedges.
I just scrub potatoes then cut into wedges (not too thick) then dry them off on kitchen roll. Put into a large bowl and add 1-2 tablespoons of olive oil (depending how many you are making) and then I sprinkle with cajun spices and give it all a good mix. Place them on a HOT baking tray and cook at gas mark 6 for about 40 mins, turning half way through.
They are lovely.