Freeze dried feijoa

Walking through my orchard in the rolling hills of San Diego, specifically just inland from the coast where the marine layer burns off by noon, the smell of ripening fruit is unmistakable. It is late autumn, and the air is heavy with a perfume that smells like a collision between a pineapple, a strawberry, and a stick of mint gum.

This is the season of the *Acca sellowiana*, better known as the Feijoa, Pineapple Guava, or locally here in Southern California, the Guavasteen. While I love eating them fresh right off the tree, there is a massive logistical problem with these green gems: they all ripen at once, and they bruise if you look at them wrong.

Alexander Mitchell

I used to lose nearly 30% of my harvest to spoilage because these fruits drop from the tree when ripe and turn to mush within three days on the counter. My breakthrough came when I invested in a lyophilizer, or a home freeze dryer.

Freeze drying feijoa transforms this perishable, somewhat gritty fruit into a shelf-stable, crunchy, intensified flavor bomb that rivals any candy you can buy at a store. If you have ever wondered how to preserve the complex terpene profile of a tropical fruit without cooking the flavor out of it, freeze drying is the only answer.

The name “Feijoa” honors João da Silva Feijó, a Brazilian botanist. While native to the highlands of southern Brazil, eastern Paraguay, and Uruguay, the plant thrives exceptionally well here in San Diego’s Mediterranean climate (USDA Zones 8-11).

Why Freeze Drying Beats Dehydration

You might ask, why not just throw them in a standard dehydrator? I tried that for years. Dehydrating feijoa with heat results in a brown, leather-like disc that loses the delicate floral high notes. The heat oxidizes the fruit sugars and destroys the vitamin C. Freeze drying operates on a completely different principle called sublimation. By freezing the fruit to -40°F and creating a vacuum, the ice in the fruit turns directly into vapor, skipping the liquid phase entirely.

The result is a product that retains 97% of its nutritional value and, more importantly, its original shape and volume. When I pull a tray of feijoa slices out of my machine, they look exactly like they did when I sliced them, but they weigh almost nothing. It is like holding a ghost of the fruit.

One of the best surprises of freeze dried feijoa is the texture change. The gritty stone cells (sclereids) that some people dislike in the fresh fruit become an incredibly satisfying, airy crunch that dissolves instantly on the tongue.

The Process: From Tree to Tray

Through our work with Exotic Fruits and Vegetables farm, we have refined a specific protocol for feijoas to ensure consistent results. The most critical variable is sugar content. You cannot pick these early; they must ground-harvest naturally or come off with the slightest touch. If you freeze dry an unripe feijoa, you just get a dry, sour puck.

Step-by-Step Preparation

1. Harvest and Sort: I collect fruit daily. I discard anything with soft brown spots. For a full batch in a medium-sized freeze dryer, I need about 10 to 12 pounds of fresh fruit.
2. Washing and Sanitizing: I wash the fruit in a solution of 1 part vinegar to 10 parts water. This removes surface yeast and dust from the orchard.
3. Slicing: This is where technique matters. I slice the fruit, skin and all, into 1/4 inch rounds. Leaving the skin on provides a tart contrast to the sweet jelly center, though some prefer to scoop the center.
4. Pre-Freezing: I lay the slices on parchment-lined trays and place them in my deep chest freezer for 24 hours before loading them into the machine. This cuts the machine cycle time down by 6-8 hours, saving electricity.
5. The Cycle: The machine takes over. It freezes the chamber to -30°F or lower, turns on the vacuum pump, and gently warms the trays. This process usually takes 28 to 36 hours for feijoas due to their high sugar content.
6. Packaging: Once the cycle finishes, I immediately package the slices in Mylar bags with a 300cc oxygen absorber.

I once ruined an entire batch by slicing the rounds too thick—about half an inch. The center of the fruit didn’t dry completely, and within a week, the moisture redistributed inside the Mylar bag, turning the whole batch into a moldy mess. Slices must be uniform and no thicker than 1/4 inch to ensure moisture content drops below 2%.

Feijoas oxidize (turn brown) rapidly once cut. To maintain a vibrant green color, you must dip the slices in a solution of lemon juice and water immediately after cutting and before freezing.

Flavor Profile and Culinary Uses

What does it actually taste like? Imagine concentrating the flavor of a fruit by removing the water that dilutes it. Freeze dried feijoa tastes like a super-charged version of the fresh fruit. The tartness of the skin hits you first, followed immediately by a burst of sweet, floral pineapple-mint flavor from the center. It is an experience that engages the whole palate.

Here at Exotic Fruits and Vegetables, we’ve found that this product appeals even to people who dislike the slime-like texture of fresh feijoa. The “ick” factor is gone, replaced by a snackable chip.

Fresh vs. Freeze Dried Comparison

Why go through all this trouble for a wrinkled green fruit? Because the culinary applications are endless. I don’t just eat them as chips. I powder the imperfect slices in a blender to create “Feijoa Dust.” This green powder is a secret weapon in my kitchen.

• Smoothie Booster: A tablespoon of powder adds tropical punch without adding water volume.
• Baking: I fold crushed pieces into muffin batter; unlike fresh fruit, they don’t make the dough soggy.
• Yogurt Topper: The crunch contrasts perfectly with creamy Greek yogurt.
• Cocktail Rim: Mix the powder with sugar for a margarita rim that smells like a tropical vacation.
• Trail Mix: Mixed with macadamia nuts and dried coconut, it creates a high-energy snack perfect for hiking Torrey Pines.

For the best yield, grow ‘Nazemetz’ or ‘Coolidge’ varieties. They tend to have a higher flesh-to-skin ratio and a sweeter flavor profile that translates beautifully when dried.

Economics and Storage

Let’s talk numbers, because farming is a business. A medium freeze dryer costs anywhere from $2,500 to $3,500. Electricity in San Diego is expensive, roughly $0.40 per kWh during peak hours. Running a 30-hour cycle costs me about $3.50 to $5.00 in electricity. However, the value add is tremendous. Fresh feijoas sell for about $3 to $5 per pound at the farmers market. A 2-ounce bag of freeze dried feijoa (which is equivalent to about 1 pound of fresh fruit) sells for $12 to $15.

Storage is the other massive benefit. Properly packaged freeze dried food in Mylar bags with oxygen absorbers has a shelf life of 25 years. It is essentially a time capsule for your harvest. I have bags from five years ago that taste exactly as fresh as the ones I made yesterday.

Ever wonder why store-bought dried fruit is often chewy and overly sweet? It’s usually because they add sugar and preservatives like sulfur dioxide to maintain color and texture. Freeze drying requires zero additives.

Growing the fruit specifically for the dryer requires some adjustments in the field. I water my trees deeply—about 15 gallons per tree every week during the heat of August and September. This ensures the fruit sizes up. Small fruits are a pain to process; you want large, egg-sized fruits to minimize the labor of slicing.

Our experience at Exotic Fruits and Vegetables has shown that customers value the “single ingredient” label more than anything else. When I tell them the ingredients are just “Feijoa,” they are often skeptical that something so sweet has no added sugar.

Troubleshooting Common Issues

It isn’t always smooth sailing. I have had batches that came out “cold spotty,” where certain areas of the tray didn’t dry. This usually happens because the fruit was stacked or overlapped. You cannot cheat the surface area rules. Each slice needs contact with the heated tray.

Another issue is oil in the vacuum pump (if you have an oil-based pump). The terpenes and sugars in feijoa are volatile. After 10-15 batches, the pump oil turns a milky white and smells like fermented fruit juice. I have to change the oil frequently, or the vacuum pressure won’t drop below 500 mTorr, which is the sweet spot for sublimation.

“Processing food is not about improving on nature, but about extending the moment of perfection so it can be enjoyed when the season has long passed.”

We at Exotic Fruits and Vegetables believe in using every part of the harvest. Even the fruits that are too small to slice get freeze dried whole (after being pierced to let moisture escape) and ground into powder for livestock supplements or compost tea boosters. Nothing goes to waste.

Final Thoughts

Freeze drying Acca sellowiana has changed the way I view my orchard. It turns a stress-inducing glut of rotting fruit into a valuable, durable asset. It allows me to share the taste of a San Diego autumn with friends in snowy climates in the middle of February. If you have access to these trees, or even just a neighbor with an overflowing yard, I urge you to try this method.

The equipment investment is high, but the payoff—biting into that tart, sweet, crunchy slice of summer in the dead of winter—is priceless. The key to success is patience; do not rush the drying cycle, or you will end up with a gummy, ruined product. Treat the fruit with respect, process it immediately, and it will reward you with a flavor that is truly out of this world.