Citrus Beurre Blanc

This recipe is great but the recipe is printed incorrectly above.  It appears in many Sunset cookbooks and print issues the correct way; not sure what happened here.  The cooking instructions above are correct, but the last three ingredients listed (the vinegar, olive oil, and orange zest) are extraneous and should not be included--the recipe should stop at the butter.  

When adding the ingrediants to the pan I looked over and noticed that I had olive oil,white wine vinegar,and orange zest left over.Went ahead and added to pan with other ingrediants and continued the recipe......Acidity was overwhelming Will try another recipe next time before retrying this again.