Texture: LTLT (low temperature, long time)
I understand that the way to get really tender caramelized onions is to pile some thinly-sliced onions in a crock pot, put some butter pats on top, and let it go on low all night long. I didn't have that long, and I wasn’t preparing more than a single onion’s worth, so I used a cast-iron skillet over very low heat. I used a mandolin to do the initial slicing and then, because I was heading for a chutney, chopped the slices. Heated the skillet, melted a bit of butter, and tossed in the onion bits. Occasional stirring for about 75 minutes before the onion began to brown (the heat was that low), then another twenty minutes before the pieces were almost uniformly brown.
When I transferred the onion into a saucepan with the remaining ingredients, I again used a very low heat. It took over a half an hour for the sauce to start bubbling. It bubbled for over an hour before I had to add water (so it could keep bubbling and softening).
Low temperature. Long time.
I used the basic proportions of the red onion confit, but eyeballed it all instead of measuring (it was just one onion, after all). But the ingredients were modified to these:
- caramelized yellow onion
- tawny port wine
- white balsamic vinegar