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How to Sun-Dry and Oven-Dry Tomatoes

Sun-dried tomatoes with olive oil
Sun-dried tomatoes with olive oil

Sun-dry tomatoes or oven-dry tomatoes to use for seasoning in salads, soups, stews, casseroles, mixed vegetables, and snacks. You can also rehydrate dried tomatoes for use in cooking.

Choose firm, ripe, full-flavored tomatoes that are heavy for their size. Tomatoes with a high acid content dry best. Excellent tomato varieties for drying are San Marzano and Principe—both flavor favorites dried, and also Roma, Viva Italia, and Early Girl.

Preparing Tomatoes for Drying:

Preparation. Wash tomatoes then blanch for best flavor and color after drying. Blanching inactivates enzymes and makes for better storing.

Blanch tomatoes in hot water or steam. Blanching can prevent dried tomatoes from turning black from oxidation—but may lessen flavor.

  • Hot water blanching: Place just enough water in a pot to cover the tomatoes. Bring water to a boil then place the tomatoes in the pot for 1 to 2 minutes. Keep lid on container when blanching. Cool the tomatoes immediately under cold water.
  • Steam blanching: Add 1½ to 2 inches of water to the pot and heat to boiling. Place colander into pot with tomatoes, cover and steam until heated through, about 2 to 3 minutes. After steaming, tomatoes should look translucent when sliced to the center. Cool the tomatoes immediately under cold water.

Slicing. Once blanched, cut out the cores and peel (but you don’t have to) then cut into slices about ⅛ to ½ inch thick with a sharp knife to avoid crushing the tissue. Cut small pear or plum tomatoes in half. Drying trays. Distribute the slices evenly on drying screens or oven trays in a single layer.

How to Dry Tomatoes:

Outdoors. Spread tomato slices out on a piece of screen (and set the screen up on wooden blocks so there is plenty of air circulation). Set the tomatoes in the sun and cover them with a cheesecloth tent so bugs and dust cannot get at them. Sun-dry tomatoes until they are brittle; this will take one or two days. Drying tomatoes in 100°F heat with little humidity is ideal. If temperatures cool at night or humidity is high bring drying tomatoes in for the night then set them back outside the next day.

Conventional oven. Spread tomatoes out on oven trays and dry them at 120°F for 18 to 24 hours or until they are crisp. Leave the oven door open about 4 inches and place a fan nearby to circulate air through the oven. Turn the slices and rotate the tray once or twice to prevent scorching. An accurate oven thermometer placed on the tray near the back of the oven will ensure the proper temperature is maintained. The temperature may vary (because the oven door is open) between 120°F and 140°F—just make sure the tomatoes at the back of the oven don’t burn. You can place multiple trays in the oven; two to four trays should hold four to six pounds of tomatoes.

Food dehydrator. Dry tomatoes at 120°F for 8 to 10 hours then turn the slices over and dry them for another 6 to 8 hours or until they are crisp.

Packing, Storing, and Using Dried Tomatoes:

Packaging and storing. Pack dried tomatoes after they have completely cooled. Wait 5 to 7 days to pack sun-dried tomatoes allowing the fruit to redistribute excess moisture. Package tomatoes securely in plastic bags, rigid plastic containers, or glass jars. Seal or cover the bags or containers tightly excluding most excess air (air and moisture are easily reabsorbed into the fruit shortening storage life). If you are worried that insects might have touched tomatoes while sun-drying, place the bags or containers in the freezer for 48 hours or more to kill insects and eggs.

Label each container with the variety and the harvest and drying dates.

Dried tomatoes can be stored in a dry, cool, dark place for 6 to 12 months. The cooler the storage place the longer the shelf life.

Rehydrating dried tomatoes. To rehydrate and use dried tomatoes, cover with boiling water or vegetable stock and let them stand for 20 to 30 minutes, stirring occasionally until they have absorbed most of the liquid. Add more liquid if the tomatoes absorb the liquid and still look shriveled. You can then cook as you would fresh tomatoes.

You can also chop dried tomatoes in a blender for seasoning in salads, soups, stews, and mixed vegetables. Dried tomatoes do not re-hydrate well for use in salads.

 

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3 Comments

  1. A quick google search indicates Roma and San Marzano tomatoes are low acid and good for drying. Yet you say high acid tomatoes are best. What gives?

    • Most tomatoes register about 4.6 on the pH scale which is low on the scale and high in acidity. All meaty tomatoes–including Roma and San Marzano–are good choices for drying,

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