I know the recipe has been pulled down, and completely understand why, but wondering who tried it, and what your results were?
I tried it on Sunday, unsuccessfully, though didn't have the dark burnt results of some others. I had 3 heads in separate jars, cooked 40 minutes at 20% power (1000 watt rated oven, though actual efficiency is unknown). I looked in at 40 minutes and it was not yet showing any evidence of maillard browning. I went another 5 minutes at 20% and it was just beginning to show some evidence of a light brown color. But when I poked it with a fork, the garlic was completely dried out and hard, although not burnt. When I went back to the recipe to scour for details I might have missed, I saw it had been pulled down.
So I tried again tonight. This time, just a single head, for 35 minutes at 20% power. At about 27 minutes I checked in on it, and it was black and burnt. The oil was vigorously boiling in the jar, and I'm guessing that any water in the bulb had long since evaporated at those temperatures.
I'm wondering if the recipe was ever tested with single jars? I believe the video showed 5 jars. If we assume a constant energy output, and that 100% of that energy is absorbed by the food load, then the higher that load, the longer you'll need to go to reach the same temperature. So 5 jars might take 40 minutes to an hour. That give a decent window for success. But with a single jar, that same energy output is absorbed in only 10 minutes or so. There is likely significantly less energy loss to convection during that time as well.
I'm guessing that although the same energy may ultimately be absorbed by 5 jars in 40 minutes and a single jar in 8 minutes, the end result may be very different. A single jar over 8 minutes may absorb the same energy, but not have the slow sustained heating that you get with a higher load. I'm wondering if that slower heat build up over the 40 minute cook cycle allows a slower and more even progression of the maillard reactions to occur, resulting in a soft, spreadable, luscious brown roasted garlic. I'm guessing the low power and high load keep the oil temperature at a relatively stable temperature as the oven cycles on and off.
If so, then cooking a single jar for 8 minutes at 20% power, would not work. However, a single jar at 4% power for 40 minutes would give the desired result. Unfortunately, I can't go to 4% power on my microwave to test this (increments of 10 only).
If all this is true, I'd also guess that going to six jars (or more within reason) may not significantly alter the results. The additional dispersion of the energy load starts to decrease and perhaps lowers the overall temperature, but I'm guessing the trick is to have a high enough load to keep the temperature controlled throughout the cook cycle. More jars may take a bit longer, but would be an even more gentle heat.
Any other thoughts out there? Was anyone successful with this recipe on a single jar? Hopefully ChefSteps is ok with continuing dialogue around this in the forum.