Math and science are hard

Last night I made seared cod nestled on a bed of sauteed spinach and red pepper with spelt penne. It was covered in a light honey-mustard sauce with capers. Looks good, hunh? Well, it was crap.
What happened? I followed the recipe, but was dividing everything by four and I think that's where I got confused. I probably forgot to do the math somewhere and it screwed up the chemical balance or something.