Just decided to make Parker House Rolls. @katellington on Twitter
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Amanda is a co-founder of Food52.
Put 1/2 teaspoon of it in a bowl and cover with 2 tablespoons room temperature water. If the yeast dissolves and becomes foamy/fluffy, it's active.
Need to add sugar, too.
Cynthia is a trusted source on Bread/Baking.
It's a good idea to check the expiration date first.