To test out Matheson’s tip at home, I’d recommend first trying it with a simple or classic gravy ... more nuanced, gravy recipes, depending on what seasonings are already in them.
Remove from the pan, cover with foil, and allow to rest. Heat up Gravox Liquid Gravy Pouch in microwave on high for 40 seconds (1100W). Alternatively pour gravy into saucepan, bring to boil and stir ...