Demi-glaces --- is anyone familiar with these brands?
I'm compiling an order on Amazon and found these demi-glaces. Is anyone familiar with any of them? Are they worth getting? Do they have much shelf life once opened? Any opinions will be appreciated.
No, they're not worth getting, in all sincerity. They are crap and will make your food taste like crap. It's like cooking with a cheap, commercial, over-processed wine. If you can tell the difference between good wine and bad, you will not be happy with commercially-prepared, shelf stable demi-glace.
Making your own is not that hard, and you make a lot at once and freeze it to use incrementally. It sounds like more effort than it it - not effortLESS, but cheap and mostly simmering without your direct attention.