Solar Cooker: “Hard-Boiled” Eggs Without Water

Hard-boiled eggs without water.

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I’ve recently been very interested in the idea of solar cooking. That is, cooking with just the power of the sun and no solar panels. Just heat, insulation, mirrors, and a sunny day in Hawaii. After a lot of research, I gathered two glass bowls, a black pot, and some mirrors and tried boiling some eggs…without water!

Our family goes through A LOT of eggs. They’re very easy for my grandma to eat (she’s missing several teeth), cheap, and they make for such a healthy snack or add-on to any meal. We go through about 20-30 eggs per week, so we are always boiling eggs. While boiling eggs doesn’t take up a ton of energy, it’s nice to know that I can just pop a bunch in the solar cooker and have hard-boiled eggs at the end of the day without turning on the stove.

Read more: How I Built My Basic Solar Cooker Setup

Preparing the eggs

The setup for hard-boiled eggs is ridiculously easy. You can put them directly into the pot, but the shells will brown wherever they touch the pot. To avoid this, I tried cutting out the paper egg cartons to fit inside the pot, which worked fine but there were dark brown spots on the egg shells after they were done. I think this is from the residual water coming out of the eggs, mixing with the paper egg carton, and staining the shells with brown water spots as they cook.

I also noticed that the bottom of the egg carton would be damp where the eggs were sitting. So I knew some of the water was escaping out of the eggs.

Hard-boiled eggs without water.
Using the paper egg carton resulted in some dark brown water spots on the egg shells.

Although thoroughly cooked, the whites of the eggs seemed to have a light brown stain similar in coloring to the egg carton. So the next time I opted for just a damp wet paper towel on the bottom of the pot. This worked perfectly. The whites were white, the eggs shells had no brown water spots, and the dampness of the paper towel allowed the eggs to cook in some steam. Next time, I might even add a splash more of water into the pot just to keep that steam effect going.

Layering the pot with a very damp paper towel worked best for me. You could even put a wet hand towel in here, too.

Cooking the eggs

What’s worked best for me so far is putting the eggs out by 10 AM and adjusting the angle every hour or so until I bring them in at around 5 PM. I work from home (my desk is right next to the front door) so it’s really easy for me to take a break from the computer and readjust the angle of the solar cooker.

If you’re going to be out of the house all day, I recommend pre-adjusting your mirrors to point toward the sun at around 1 PM. I’ve found that the hottest time of day in Hawaii is about 12 PM to 2 PM so you want to be sure you’re doing your max cooking at that time.

Hard-boiled eggs without water.
Daisy sunbathing with the eggs. She’s sniffed everything I’ve cooked so far but I think the heat keeps her from toppling it over. You might want to put your solar cooker on a table if your dogs are prone to bumping things over.

Although hard-boiled eggs is super basic, I am really loving the experience of cooking my own food without adding to the bill. My plan is to test different recipes with this simple setup to find out its limitations, but I’d eventually like to make a larger solar oven that will allow me to bake breads and desserts and is capable of holding larger pots and several dishes. Stay tuned for more!

Aloha with love,
Amy

Korean Chicken

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