HOW TO PREVENT MOLD FROM GROWING ON JELLY
Typically, jelly and jam don’t develop mold on their own, because of the high acid of the fruit and the preservative action of the sugar. But mold spores can sometimes enter a jelly jar via contamination from a utensil that was previously used on another foodstuff—the bread for example. A microscopic piece of bread with a mold spore can adhere to the spoon or knife when you spread the jelly on the bread.
We refrigerate open jars, and we’re especially cautious of cross-contamination, using a separate spoon for the jelly. But it is possible that when we spread the first spoonful of jelly on the bread, it picked up a microscopic mold spore that got introduced to the jar when we went for a second spoonful.
A jar can get mold contamination from a spore of bread. Photo courtesy Peanut Butter & Co.
So today’s tip is: Don’t double dip that spoon or knife. And toss out a jar with mold.
WHEN YOU CAN KEEP FOODS WITH MOLD
There are thousands, if not millions, of different types of mold, from beneficial ones like penicillium (which is used to make the mold in blue cheeses) to toxic ones. Experts warn that scooping out the visible mold is not a solution, since the mold shoots microscopic tendrils deep into the foodstuff.
According to the U.S. Department of Agriculture, you can save hard cheeses, firm fruits and vegetables by cutting out at least an inch around and underneath the mold spot. But the organization advises you to toss baked goods, bread, casseroles, grain, jams and jellies, legumes, meat, nuts, pasta, peanut butter, soft cheeses, soft fruits and vegetables, sour cream, yogurt and other foods.
The list of what you can keep is easy to remember because it’s so brief: hard cheeses, fruits and vegetables. Bid adios to everything else.