Hi Gail, the recipe for Morning Glory Muffins in our new edition of the All-Purpose Baker's Companion is, indeed, a little different from this recipe. It calls for our Unbleached All-Purpose flour rather than White Whole Wheat, which I think explains the omission of the orange juice. Whole wheat flour absorbs more liquid than AP flour and many of our recipes that call for whole wheat flour include orange juice as well, because this ingredient is thought to temper the bitterness of regular whole wheat flour. While the orange juice is certainly helpful in the whole wheat version of this recipe, I don't think it's necessary in the recipe you made. If you want to make this recipe and you don't have orange juice, I think it would work fine to substitute milk or water for the orange juice, as the brown sugar and the tart apples are likely supplying the necessary acidity to activate the baking soda. 

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