To make ahead
Prepare through Step 3. Store tortilla crisps in an airtight container at room temperature for up to 1 week. Refrigerate soup for up to 3 days or freeze for up to 4 months. (The soup may thicken; add additional broth or water to achieve desired consistency.)
Tomato paste contributes lots of umami (savory flavor) and very little sodium to a dish. You seldom use an entire can in a recipe and thus are often left with inconvenient leftovers. You can freeze the extra, but you can also purchase tomato paste in tubes. Once opened, a tube will keep in the refrigerator for up to 1 month.