Alton Brown is the man. He is, in his heart of hearts, as frugal as they come. On his show Good Eats, he always railed against unitaskers– items which have only one purpose, and aren’t useful for anything else. One such contraption is the food dehydrator, and Alton knows it. There’s a classic episode of Good Eats where he builds a box fan food dehydrator and shows that dehydrated food need not come from a bag or an expensive appliance.
I’ve always wanted to try the box fan dehydrator, so today I went out and grabbed what I needed at the cheapest prices I could find. One of the items recommended on Good Eats was a dehydrator liner, but I found that the plastic canvas carried at craft stores works just as well. These are the heavy plastic screens used by children for their first needlepoint projects, so check the needlework aisle.
After executing on Alton’s design, I came up with a pretty cool planning tool for those of you looking to do a lot of dehydrating, but we’ll get to that later.
|Bungee Cords||Home Depot||$3.48|
|3 Cotton HVAC Filters||Home Depot||$11.91|
|6 Plastic Canvas (.69 Each)||Michael's||$4.14|
My research on Amazon suggests that if you had to purchase all of these items, you would spend about as much as the least expensive dehydrator on the site, though the reviews for that mention something about melting trays, which sounds problematic. Many people already have access to a box fan and bungee cords, so it’s possible you can spend around $15 to have a working food dehydrator. Plus, even if you do buy all these items, at least you’re left with a box fan and some bungee cords, so at least we’re not buying unitaskers.
I’m experimenting with not eating meat at the moment, so I’m making dried fruit. Here are the steps I went through to make dehydrated banana and strawberry.
First, I bought some bananas and strawberries (duh). This cost me 29 cents per banana (I bought five) and $2.99 for a pound of strawberries. I wasn’t able to get all the strawberries on the plastic canvas, but I got all but a couple strawberries on one set of mats.
This is a pretty simple process:
- Lay the box fan flat, suspended between two chairs so that there is ample room for airflow, aiming the direction air will flow upwards.
- Lay one of the HVAC filters on top of the box fan.
- Slice the fruit or meat into thin slices or strips. If you are drying fruit, you may want to briefly toss the fruit in a bath of water and lemon juice. The citric acid will help keep it from browning.
- Once the fruit or meat is ready, lay it on one of the plastic canvas pieces. Place the canvas pieces on the filter.
- Lay another plastic canvas on top, creating a sandwich of the item you are dehydrating.
- Place another filter on top of each sandwiched layer of food. Some trial and error with the direction of airflow suggests that the arrows on your filter should point towards the fan (the side with the metal and cardboard backing should be on the bottom). The total number of filters shouldn’t exceed 3-4, depending on how strong your fan is.
- Use a couple of bungee cords to secure the filters to the fan. Don’t make it so tight that the filters get squished.
- Turn the fan on to a setting strong enough to blow air consistently through all the layers, but not so strong that it crushes the filters or causes them to buckle.
- Run the fan in the driest environment you’ve got. Depending on the water content in your food, it may be 12(fruit)-48(meat) hours before it is adequately dehydrated. You can start checking after 12 hours for fruit and 24 hours for meat, and each 12 hours thereafter.
Almost exactly 24 hours later, I am munching on a beautiful batch of dried strawberries and bananas. The fruit have no added sugar or preservatives (aside from a tiny bit of lemon juice, of course) and the entire process was almost completely hands-off except for the slicing.
I learned a few things along the way, such as:
- Be patient and don’t try to peek in the first 24 hours. You’ll only tear the fruit apart.
- Once they’re dry enough, even wet fruit will separate by themselves from the plastic canvas.
- It’s better to over-dehydrate than the under-dehydrate.
This was a really fun project, but was it frugal?
According to an informal survey of Amazon, 1 pound of dehydrated banana costs about $7-10, and five pounds costs about $20. So, we’re looking at about $4-10 per pound. Dehydrating four bananas included the cost of the bananas (4 x .29 = $1.16) and the cost of the power (.02 per hour according to my calculations, so about 96 cents on the outside). A banana is 74% water, and we want to remove 75% of the water when dehydrating something. That means one pound of peeled bananas should produce .445 pounds of dehydrated banana. Four peeled medium bananas is about a pound, so we’re looking at about 8 bananas x .29 unit cost + .96 electricity cost, or $3.28 per dehydrated pound for banana. You could bring down the cost by dehydrating more at a time, and by getting a better-than average price on bananas.
Let’s have a little more fun and create a pounds-raw-to-pounds-dehydrated conversion table. In the following table, we calculate the dehydration multiplier by taking:
(100 – % water)/100 + (% Water / 100 * .25)
The dehydration multiplier multiplied by the weight in raw materials gives us the dehydrated weight. Bananas have a dehydration multiplier of .445, so if you dehydrate 10 pounds of raw bananas, you get 4.45 pounds out.
|Food||% Water||Dehydration Multiplier||lbs Raw for 1 lb Dehydrated|
|Food||% Water||Dehydration Multiplier||lbs Raw for 1 lb Dehydrated|
|White meat chicken||69||0.4825||2.07|
|Dark meat chicken||66||0.505||1.98|
|Beef, eye of round||73||0.4525||2.21|
|Beef, whole brisket||71||0.4675||2.14|
When it comes to fruit, the answer is probably “it depends on the fruit.” If you crave a high-multiplier, low-cost fruit like bananas, probably. For low-multiplier, high-cost fruit like strawberries, this probably won’t ever make economic sense.
I am fairly certain that it is a huge savings when making your own jerky, though. A few ounces of jerky can cost as much as $5-6 dollars, so buying meat on special and dehydrating it at home should result in big time cost savings. Beef is just under 75% water, so you’re looking at about 2.2 pounds of meat per pound of beef jerky. If you can get a $3-4/pound deal on the meat of your choice, you can make jerky for less than half of what it would cost in the store. Just make sure to slice very thin, and use a quality marinade to raise the pH level and kill any microbes.
This is also a great way to make dog treats at a substantial savings.
In the end, this was a pretty badass project, and I’ll definitely do it again. It’ll be a big help in avoiding food waste, which has been one of my big problems in the past few years. If you’ve got a box fan at home, give it a try! The result will be delicious!