Never made orange icecream but I'd just make like any fruit icecream (my basic recipe with 250 ml milk, 300 ml cream, 3/4 cup of castor sugar - then for a fruit one just add around 250g of fruit eg mashed strawberries, peaches etc) so I'd just peel the orange making sure there is no pith and deseed as much as possible, then whizz it up in the tmx, add the rest of the ingredients and mix (then make icecream however you do - I use my icecream maker so no help there).