Store baking soda in a cool, dry place for up to 6 months, or longer if stored in an airtight container. To test for freshness, stir ¼ teaspoon baking soda into 2 teaspoons vinegar; bubbles indicate that the baking soda is still active.

Paulette Mitchell, a culinary instructor, television personality, and the author of 10 cookbooks, is known internationally for her quick-to-prepare recipes with a gourmet flair. Her 15-Minute Gourmet cookbook series, including Chicken, Vegetarian, and Noodles, was awarded "Best Cookbook Series in the World" at the 2000 World Cookbook Fair in Périgueux, France in November, 2000. Her Complete Soy Cookbook was named "Best Health Cookbook" at the same event in 1998. To buy Paulette Mitchell's cookbooks, click here.