I think roast veg and dauphinoise potatoes would be too rich to go with roast duck. I would serve boiled new potatoes (Jersey Royals if possible) and a selection of plain veg such as green beans - cauliflower - broccoli - carrots. Also you could do red cabbage - chopped with a small chopped cooking apple - put into a casserole with some butter - heat on the hob stirring until everything is coated with the butter - cover with boiling water - put in the oven with a lid for about 2 hours - strain and serve. This can be frozen and reheated. Do not forget to put the duck on a roasting rack to keep it from sitting in the fat while it is cooking.
I've gone for the roasted veg but I didn't realise the duck had giblets so I'm making a stock at the moment and hopefully will make a nice sauce from that. I'll do plain spuds with it
I like the sound of your red cabbage though.
I won't forget the rack....nothing worse than pouring hot fat off half way through cooking :-)
never tried doing my own roast duck, but will give your suggestion a try this Sunday. sounds absoluitely delicious.
thanks for warning about giblets (can't stand the look of 'em)