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