Okay folks - this is it, the vegan and gluten-free gravy you've all been waiting for! All your favourite gravy flavours are simmered into a savoury broth that is thickened with corn starch. All your vegan and gluten-free poutine, mashed potatoes, and just general happy dreams will come true.
In a medium pot over medium-high heat, bring all the ingredients except for the corn starch to a boil.
Turn the heat down to low, and let the broth simmer--covered--for roughly 30-45 minutes. It'll still taste great if you only have 15 minutes to simmer, but use that extra time if you have it.
Strain the broth, making sure to squeeze out all the broth and juice from the onions. Place the broth back over low heat.
In small dish, mix the corn starch and a couple tablespoons of cold water. Once it is all dissolved, slowly whisk the slurry into the broth.
Continue to simmer until the (now gravy!) thickens, about 2 minutes.
Serve immediately and enjoy!!