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In the same skillet as the burger patties, add more avocado oil if your burgers didn’t render any fat.
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Add mushrooms and onions to the skillet and saute until onions start to caramelize. Make to scrape the bits left from the burgers.
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Add in the beef broth, coconut aminos, fish sauce, and black pepper.
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Bring the gravy to a boil, and then lower the heat to bring gravy down to a simmer.
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While the gravy is simmering, mix arrowroot flour with about 2-3 tablespoons of warm water to create a slurry.
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Pour the slurry into the gravy making sure it is well combined.
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Simmer gravy until it thickens which will take about 10-15 minutes. Once thickened, taste to see if you need more salt.
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Add the burger patties back to the skillet to warm up.