Most solar cooking advice says that food won't burn. I've found otherwise.
This weekend I tried the roast chicken and it was wonderful. All I did was take a roasting chicken, rinse it off and put it in the lidded roasting pan with a few potatoes inside and more around the edge. I dotted it with butter and mushed garlic and sprinkled on a bit of rosemary on top. I put it out and had my husband check it ever so often while I took my daughter and her friend to the local ren faire. At the end of a long hot interesting day, we came home in awful heat and the chicken was perfect. It was brown on top and absolutely tender. A real successful dish. Even my daughter's teenaged friends could not resist trying a bit and were enthusiastic about it.
The next day I wanted to make some more potatoes since we finished off the ones from the chicken, but the pan was still in use as the chicken wasn't quite finished off. I didn't have anther dark casserole dish with a lid that was big enough, so I thought I would just use a dark baking dish without a top. I had heard it was smart to put something dark on top, so I thought to use some dried tomatoes. Having a bunch of peppers to use from the garden, I simply topped raw potatoes quartered with strips of peppers and then a layer of the dried tomatoes along with a bit of butter and lots of garlic (why yes, I do use a lot of garlic, thank you for noticing.)
Here's what it looked like:
We then left to run some errands and a few hours later, I went out to turn the cooker to the sun and found the tomatoes burnt to a charcoal black:
The tomatoes were a complete loss - black through and through, although the potatoes were still edible. I noticed that they were dryer and tougher than what I usually get for potatoes cooked in this cooker. When I went out to put away the cooker, I found the bottom full of water with a bit of oil from the butter. So with this evidence, I made these conclusions about working with this cooker.
This particular cooker seals the chamber in which you put the food. There is a rubber edge to the top and glass seals down and keeps the water inside the cooker, making it mostly a steam cooking. The steam condenses on the underneath of the glass top and rains back down. This time I put the food in what amounted to a stoneware pie pan. If I was baking biscuits or a cake, this would have been fine, but I was making vegetables. If they had been in a dish with a lid, the steam from the food would have stayed mostly in the dish to be constantly recycled, boiling into steam and condensing back down. When the lid is off, the liquid in the dish boils over, drips down the sides and sits in the bottom of the cooker, to boil down there below the food and not being effective at all in the cooking and essentially removing the moisture from the food.
Now if what you want is dryness, that might work, but not in this case.
So understanding better the tool I am using I go on to try more recipes and write about the results.