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I make this sauce often but only recently discovered the differences between the recipe in the earlier "Classic" cookbook and the more recent "Essentials".There are some fairly significant differences in the two recipes.The earlier uses olive oil in addition to butter and much less veggies and less milk and the order of adding the wine and the milk is opposite.

I am curious if anyone has noticed a significant difference between the two. I just made a batch and followed the original recipe except I followed the wine/milk order in this recipe. I will post a comment when I tase the results.