If you need to add 1/4 tbsp of salt to every 1/2 cup of unsalted butter to make it salted, then how much salt do you add to 1/3 cup of unsalted butter to make it salted?
If you come across a recipe that calls for salted butter and all you have is unsalted butter, use unsalted butter and increase the salt in the recipe by 1/4 teaspoon for every 1/2 cup of butter
