An Expert's Advice For Shopping For Gourmet Butter - Tasting Table
Briefly

Seek out high-quality butter from local, Irish, or French companies with high butterfat content for better taste and color in baked goods.
Butter's fat and salt content play crucial roles in the texture and structure of baked goods, affecting density, fluffiness, and overall flavor.
European butter, with higher fat content than USDA standard, provides creamier texture and richer flavor due to less tasteless water content.
Read at Tasting Table
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