Why European Butter Tastes Better Than American Butter In Alfredo Sauce - Tasting Table
Briefly

European butters often outperform American ones due to their higher milkfat content, leading to richer flavor profiles and textures that enhance sauces like Alfredo.
American butter typically has an 80% minimum milkfat standard, while European standards range from 82% to 90%, offering creamier options that improve the overall dish.
The taste of butter varies significantly based on the cows' diets; European butters often come from grass-fed cows, producing a more complex, earthy flavor.
While European butters tend to be more expensive in the U.S., the availability of high-quality American butters is increasing, offering viable alternatives for rich sauces.
Read at Tasting Table
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