Using a Glace to start a stock...
I'm going to be cooking for a large number of people in a little while. I have an idea to make a vichyssoise, but I won't have enough time to make a good stock.
I was thinking of making a Glace (a very concentrated stock, if it has another name) and using it to start the stock on the day I'll be cooking the soup.
The reason I can't just make the stock in advance is because we'll be going up to a facility that's far away from my house, so I can't just bring a pot of stock along.
Does a Glace work well as a stock starter? It's for 15 people, so if it works, about how much would I need in order to give everyone 2 cups of soup?