1. Eggs
Whole eggs should be kept out of the freezer. The egg could expand and crack the shell, allowing bacteria to creep in. Even if the shell remains intact, the yolk will become syrupy and hard to blend with the egg whites, according to Ask Karen, the USDA's food safety information portal. Similarly, icings or sauces made with eggs can turn tough or rubbery in the freezer.
Tip: If you have to freeze eggs, whisk yolk and egg whites and add 1 ½ tablespoons of either sugar or corn syrup, or ½ teaspoon of salt to prevent graininess, according to the National Center for Home Food Preservation (NCHFP).
2. Certain fruits and vegetables
Some produce, especially those with high water content, will be limp, soggy, and possibly have a change in flavor or smell after freezing and thawing. Lettuce, cucumbers, cabbage, and watermelon are all better off in the fridge. Other produce, like tomatoes, can be frozen but should only be used in cooking, since they become mushy after thawing, according to the Institute of Agriculture and Natural Resources at the University of Nebraska-Lincoln.
3. Cheese
Soft cheeses, like goat, brie, and ricotta, tend to separate and take on a grainy texture when frozen. Hard cheeses, like cheddar, can hold up better in the freezer — though they could also turn mealy.
4. Other dairy
Almost all dairy products are not freezer-friendly. Sour cream separates and becomes watery, and cream, yogurt, milk and milk-based sauces may curdle and separate.
5. Seasonings
Most spices and seasonings should stored exclusively on your spice rack. Freezing does not extend the shelf life of spices, and according to the NCHFP, freezing causes taste and flavor changes. Garlic, pepper, and imitation vanilla will become bitter, onion and paprika may change flavor, and curry in known to “develop a musty off-flavor.” Yuck!
Fresh herbs, on the other hand, can be frozen, but use them for flavoring only - they become soggy and limp, not the best bet for a pretty garnish.
6. Fried foods
The yummy crispiness we love about fried foods disappears after a trip to the freezer, because thawing makes formerly crunchy foods waterlogged and soggy. The exception here is homemade French fries, which can be cooked, frozen, and cooked again without thawing first. They’ll still taste good and crisp up, plus you can make them healthier by limiting the amount of oil and fat you use to make them.
7. Dressings
Salad dressings and condiments like mayonnaise are better left in the fridge. Although they’re safe to eat after thawing, freezing will make the ingredients separate. The eggs, oil, and vinegar in mayo will all separate, leaving liquid on top of the mayo. Attempting to return it to its original texture might not work, and if it does, you’ll have a thinner, watery substance left.
9. Cooked pasta
Some fresh pastas can be kept in the freezer before cooking, but stick to the fridge for storage after cooking. Freezing cooked pasta will turn it into a mushy mess, and give it a weird, “warmed over” taste, to boot.
Thanks to Jessica Dysart for sharing her article.