Melt 1 tablespoon unsalted butter in a medium skillet over medium heat. (carrotsandspice.com)
baking soda 3/4 cup unsalted butter cold, cut into chunks 1 large egg 2 tsp. (you-made-that.com)
I made the mistake of using unsalted butter in my toffee today and got a separation anxiety and have never, ever had a problem before. (cookingforengineers.com)