Key Ingredient

"Mom, can I bake a cake for Mrs. Grahame?" asked Gianna.Mom looked at her in surprise. Gianna often complained about their elderly neighbor. "That's a nice idea," Mom said. "But why do you want to do that?""At church yesterday we had a lesson on kindness. We're all supposed to do something nice for somebody this week," Gianna explained."Okay. What kind of cake do you want to make?" Mom asked."I'll just make my favorite chocolate brownie cake. It's easy, and I've made it so many times I know the recipe by heart."Gianna went to the kitchen, opened the pantry door, and started pulling out ingredients. She measured and stirred, and soon the cake batter was ready. While she rummaged in the cupboard for the right size tin, her dad walked in. He tiptoed over to the cake mixture, picked up a spoon, and tasted the batter. "Yuck!" he exclaimed. "What went wrong? I think you forgot something."Startled, Gianna jumped and whirled around. Then she laughed. "Dad! Quit teasing!" Dad shook his head. "T