In a food processor, combine the tomatoes, garlic, olive oil and seasonings. While dehydrated food does keep far longer, it can still spoil. Stir for a few minutes, then drain. But if you would like to rehydrate and plump them up a bit, just soak the sun-dried tomatoes in hot water for 20 minutes, then drain. The end product of sun-dried tomatoes must be perfectly dry but not crispy, with no … How To Rehydrate Sun-Dried Tomatoes. This technique is still used today but mainly for commercial use. In Italy fresh tomatoes were placed on tile roof tops as a way to preserve them for the winter. Puree until smooth. Add some very hot water to cover. served right out of the jar. Put the tomatoes in a medium bowl. Sun-dried tomatoes stored in olive oil are perfectly edible (and delicious!) Refrigerate for up to 2 weeks. Your sun-dried tomatoes should last up to seven months when stored under proper conditions. Sun-Dried Tomatoes Warning . Sun dried tomatoes are fresh ripe tomatoes that are placed in the sun to remove almost all of their water content. Unlike Sunblush tomatoes the sundried variety are somewhat unattractive. (this softens the tomatoes and gets rid of some of the packing oil).