Sun dried tomatoes are great additions to any dish. It can be used in pastas, entrees, and appetizers. There are recipes that call for re-hydrated sun dried tomatoes. Re-hydrating sun dried tomatoes just mean that you infuse the sun dried tomatoes again with liquid. There are two ways in which sun dried tomatoes are re-hydrated. First, it can be added directly to the stock or liquid of the dish you are cooking. Another method is to re-hydrate the tomatoes first before adding it on. You may re-hydrate the sun dried tomtoes in extra virgin olive oil, stock, or any liquid that you want the sun dried tomatoes to get the flavor off.