Question

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?

Answer 1

1/6 tbsp of salt.

Explanation:

To make 1 cup of salted butter you need to add 2 * 1/4 = 1/2 tbsp of salt

So for 1/3 cup the amount of salt = 1/2 * 1/3 = 1/6 tbsp.

Answer 2

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

Explanation: