First off it's heartbreaking to hear about a death like this, but I have to say this. If I was deathly allergic to an ingredient, why even eat out? Putting your life in the hands of a food service employee is flat out rediculous.
Kirkland grass fed salted butter and it's not even close. Cheaper than the fake butter at my local grocery. Much like the eggs, pasture raised is about the same price as "cage free." It's best to get the best. 🧈