Do you need to refrigerate factory-made pesto sauce BEFORE opening its glass jar?

Here's why:

* Preservatives: Factory-made pesto often contains preservatives that help extend its shelf life.

* Sealed Container: The sealed glass jar acts as a barrier against air and moisture, further preventing spoilage.

However, it's always best to check the label. Some manufacturers may recommend refrigeration even before opening, especially if they use less preservatives.

Once opened, you should definitely refrigerate your pesto. This helps maintain its freshness and flavor for several weeks.