The Grapes of Wrath Part II: How to make Homemade Raisins in the Oven


“and in the eyes of the people there is the failure; and in the eyes of the hungry there is a growing wrath. In the souls of the people the grapes of wrath are filling and growing heavy, growing heavy for the vintage.”
― John Steinbeck, The Grapes of Wrath

In my backyard, there is no hunger growing for lack of grapes. I am riddled with them beyond all reckoning. Now I’m nowhere near ready to hire out migrant workers and there are no worker camps set up in the vacant lot next to mine, so perhaps things are not as dire here as they were in Steinbeck’s classic work. But I can’t steal his title without a shout out. Wouldn’t be polite.

In the eyes of this urban farmer, there is no room for hunger or wrath. There is a growing sense of panic, however, as my bazillion bunches of grapes begin to ripen all at the same time. Check here for more grape emergency details. Myself, my friends and my chickens have eaten their fill already and we can’t even put a dent in the vast amounts of grapes that are ready to go. TODAY!

One friend suggested I make raisins out of them, so on Sunday I gave it a go. Now typical raisins are made from Thompson seedless grapes, but I don’t have those in my yard. I have Niagara grapes, which are also seedless but a little bit smaller. Any seedless variety will do, but even grapes with seeds can be made into raisins. Albeit crunchy raisins, but the seeds are loaded with heart-healthy nutrition.

The Niagara grapes produce a tart raisin that reminds me of a tastier and more wholesome Fruit Roll-up. Or Fruit Leather, if you’ve ever had that. They’re actually quite yummy and better yet, will last for years as long as they’re kept in a dark dry place. I’m storing mine in some mason jars, but I doubt they’ll last more than a few days on account of how fast they are going now.


Regardless of what grape you decide to use, the steps are the same. I don’t own a dehydrator, so this will be the oven method. You can even let the sun dry them out, but it takes a lot longer (several weeks) and you run the risk of insects, mold or something that resembles a raisin but is not. If you follow. Poop for those not paying attention. The controlled environment of your kitchen seems to me to be the smarter and faster route.

Another thing that helps when preserving fruits or berries that have a waxy skin is to blanch them. That means soaking them in hot water for about 30 seconds and then placing them into ice water right after that. This causes splits and cracks in the skin and allows for a more even dehydration. Here’s how I did mine, step by step with fancy schmancy photographs of each step.

Step 1: Get yourself some grapes. Duh.

How to Make Organic Raisins 01b_Niagara Grapes
1/500th of my total harvest of Niagara grapes.

How to Make Organic Raisins 02_Niagara Grapes Detail
Not the largest or sweetest grapes in the world, but still tasty.

Step 2: Blanching or “checking” the grapes.

I heated up some water on the stove and prepped a bowl of ice water next to that. One thing I noticed is that the ice water quickly became luke-warm water after about five or six bunches, so be sure to have some backup ice ready to go!

How to Make Organic Raisins 03_Blanching the Grapes step 1
At this point I realized that my hands might not be the best tool for this job.
How to Make Organic Raisins 04_Blanching the Grapes step 2
Ahh, that’s better! A slotted spoon or some tongs will do the trick!
How to Make Organic Raisins 05_Blanching the Grapes step 3
About 30 seconds and you should see the skins cracking and the color getting more pale.
How to Make Organic Raisins 06_Blanching the Grapes step 4
Remove the grapes carefully when they look like this.
How to Make Organic Raisins 07_Blanching the Grapes step 5
Lower them into your prepared ice water.
How to Make Organic Raisins 08_Blanching the Grapes step 6
Allow them to cool down for a minute. If the ice cubes have melted, add some more.
How to Make Organic Raisins 09_Blanching the Grapes step 7
Voilà! Some weird looking blanched grapes!

How to Make Organic Raisins 010_Blanched Niagara Grapes
Here’s my giant pile of grapes ready for plucking and sorting. Fun times ahead.

Step 3: The arduous task of removing grape from stem! Have the kids help with this “fun” part.

Oy vey! What a chore this step was, especially when you consider that I only harvested 1/500th of my entire yield. But I muscled through it. If you have a cookie drying rack or some metal screening, I recommend Using it here for better air circulation. I do not have these fancies in my meager kitchen, so I simply used cookie sheets. The only down side is after 12 hours you need to flip the raisins over so they don’t stick to the pan. Not that big of a deal so long as you don’t put them into the oven at 12:30 in the afternoon like I did. Yawn! The next day I was sleepy at work and a coworker asked, “up all night partying?” I had to say, “no, I was up late making raisins. You know, it’s all part of my rock and roll fantasy.” They promptly walked away.

Anyways, whatever you use, make sure that all the grapes are all placed in one layer and not stacked on one another. Like this…

How to Make Organic Raisins 12_Niagara Grapes ready to go in the oven Detail
A bazillion grapes ready for the next step.
How to Make Organic Raisins 11_Patting Niagara Grapes with Paper Towel
Once placed, use a paper towel to gently pat them dry to help the process along.
How to Make Organic Raisins 13_Niagara Grapes ready to go in the oven
All set and ready to go in the oven! The smaller or unusable grapes went to the chickens and disappeared in about 45 seconds.

Step 4: The slow dry cook.

How to Make Organic Raisins 14_Oven set to 180
Or as low as your oven will go. At 180°, the overall cook time was 17 hours.

I set the oven at 180°, but I found that they looked like they were drying too fast so I reduced it to around 170° after about 10 hours. Over all, it took about 17 hours to make with a flip at around 12 hours. I was expecting 18 to 24 hours, so if your oven can go lower, give that a try. I’ve even read that you should prop the door open a bit to slow things down more. You’ll know they are done when, well, they look like raisins. I sampled several after 16 hours and felt they were close.

Step 5: Eat the raisins!

Kind of a no brainer huh? Allow them to cool off before storing them in anything. Once they are cool eat some and store the rest in any airtight container. Place that container in a cool dark spot like the cupboard. They’ll keep for years! If they look hard and crystalized with sugar after a year or two, just place them in warm water for a few minutes and they’ll spring back to life again! If they are getting moldy, you’ve had a moisture invasion and you need to toss them. Sorry.

And without further adieu, my paltry results…

How to Make Organic Raisins 15_Fresh Raisins
Organic homemade raisins! So yummy and an excellent way to preserve a large harvest.

So now I just have to repeat these steps about 378 more times and I should be good to go for this season. They are yummy though and can be stored for years so it’s a good solution if you happen to have a surplus. If you don’t have a surplus, it’s still a fun project that I imagine any child would really have a blast doing! I just happen to be a rather large child. With greying hair, aching back muscles and this annoying thing called a mortgage. Oh well, in my heart I’m only around 6 years old. And that’s all that counts right? No, not according to my bank. Will they take grapes in lieu of mortgage payments?

Tune in next week when I make some other food stuffs/creative fashion accessories out of these damned grapes!



21 Replies to “The Grapes of Wrath Part II: How to make Homemade Raisins in the Oven”

          1. Yeah, huge difference after the winter pruning. What I love about grape vines is how self sufficient they are. Little water or fertilizer needs. In fact they prefer so-so soil.

    1. Thanks Matt! I’d feel so much better if it had made a dent in the harvest though. I think Nury and I will be making juice this weekend, and then popsicles after that. Hopefully that will help. Next year, I’ll be ready for wine!

      1. I’d be having a good whine with trying to work out ways to use all of those grapes, too….oh wait 🙂
        You could trademark a gielownay or diegonay – you never know, it could be the next big thing!

  1. This is a new take on making raisins. Have you run the economics on it like you did for eggs? That would be an interesting post.

    My own experience with raisin making started at a young age – at about 3am. It rained on my Grandfather’s raisins and he couldn’t get enough workers fast enough. I never was a morning person. My poor mother had to raise the dead at an ungodly hour. So there we were in the dusky vineyard shivering and waiting for the sun to rise. My Grandfather pacing back and forth fretting. “Glory be me!” and “For crying out loud!”.

    Next came backbreaking work slipping trays. The raisins were laid out on paper trays to dry in the sun. We had to go through the vineyard moving trays to places were the soil was already dry to keep them from molding on the bottom. Those trays were about 30 pounds ( or was is 300?). Try as we might, we couldn’t keep up with the pros. Just the same, the job was fairly fun – until it got hot.

    Growing up, most of my “farming” experiences started at 3 am under similar conditions. It wasn’t until too late that I realized that putting me to work on the farm was one of the best things my parents ever did to me. By then, I was on a different career path. I now dry my fruit on my air conditioner condenser and pray the rain doesn’t show up to turn every thing into a horrible sticky mess before it all dries. One summer I converted a Harbor Freight trailer into a mobile drying rack. I could wheel it into the garage if a monsoon loomed over the San Bernardino Mountains. Unfortunately, the Mojave winds kicked sand into what where otherwise beautiful dried apricots – lots of them. My parents dried their tomatoes on the diving board of their pool. Apparently the squirrels didn’t figure out the one access point to the trays of tasty tomatoes. Drying fruit could easily be a source of sitcoms. 🙂

    1. At the time all I could do was to try and keep up with all those damn grapes. It’s looking the same for this year too despite my aggressive pruning. This year I’ll be ready! Maybe.

      I’m envious of your farm upbringing. I’m just a dirty city boy. But I’m catching up on my rural training!

      I love your story about the great grape emergency! I can relate on a smaller scale…

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