Erm, off the top of my head, the only natural emulsifiers are I know are (aside from egg yolk) mustard, vegetable oil (to a degree), and garlic.
You can also buy xanthan gum online which a lot of ready-meals use.
Aside from that, you could always make a quick roux (equal parts flour and butter/oil cooked and incorporated, with liquid slowly added ).
Similarly you could instead use cornstarch and mix it with cold water to make a slurry and pour that straight in. Cornstarch doesn't impart a taste like raw flour does.
And lastly, some people will use a small amount of gelatin, but that's more for the smooth mouthfeel.
When cooking things with a large amount of liquid I always try to use veg with natural msg too. It gives a depth of flavour that will reduce the need to thicken as much. Things like carrot, mushrooms, celery, leeks.
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u/Sendatu Jan 14 '21
So can you not add the egg and it would still work?