It's a possibility but I suspect that the strength of the flavour of the onion and mustard will dominate over the orange. You might try cutting julienne strips of orange peel, blanche them in a couple of changes of water. Then dress the carrots with the fresh orange juice before stirring the strips of peel in. Or you might try reducing the orange juice by gentle simmering to intensify the flavour. Also, you used to be able to buy frozen orange juice concentrate which might do the job better than fresh juice.
I have never done this recipe, but in my book it says toss the carrots in orange juice,butter and brown sugar . After cooking the carrots ,drain return to pan pout a 1/4 cup of orange to 1lb of carrots add 3 tablespoons of brown sugar 2 tablespoon s of butter ,a pinch of salt simmer over a med heat for five mins untill butter and sugar has melted.
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