Recipes call for unsalted butter so cooks and bakers can control the amount of salt in their dishes and baked goods.
Salted vs. Unsalted Butter: Everything You Need to Know
Why is unsalted butter and salt used in sweet/pastry recipe instead of just using salted butter only ?? : r/AskCulinary
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Unsalted Butter vs Salted Butter in Baking - Crazy for Crust
Why Do Recipes Call for Both Unsalted Butter and, Later, Salt?
Why Do Recipes Call for Unsalted Butter?
Why Do Recipes Call for Unsalted Butter? — Epicurious
Why do some recipes call for unsalted butter - then add salt?
Why Do Recipes Call for Unsalted Butter?