Maple syrup: Indefinitely
Stored at room temperature, maple syrup will go bad in two years, but if you store it in the freezer, it can last forever, according to savethefood.com. Interestingly, pure maple syrup doesn’t actually freeze, which makes the freezer a great place to store it (in an airtight container, of course).
Dry lentils and beans: Indefinitely
“These can last indefinitely, but after one year they may need slightly longer cooking times,” says Jennifer Kaplan, an author, and an instructor at the Culinary Institute of America. “Store them in an airtight glass container in a cool, dark, dry place. Do not wash until just before use.”
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Brown sugar: Indefinitely
“Brown sugar can last indefinitely, but will likely need to be softened,” Kaplan says. But don’t leave the open bag in your pantry and expect the quality to remain the same. Kaplan recommends moving it to an airtight glass jar, then stowing that somewhere cool, dark and dry. White sugar can last indefinitely when stored that way too.