1 (10.75 ounce) can cream of mushroom soup
1 (10.25 ounce) can beef gravy
1 1/4 cups Marsala wine
1/4 teaspoon kosher salt, or to taste
Whisk together the mushroom soup, beef gravy, and Marsala wine in a saucepan. Bring to a simmer over medium heat and cook for 10 minutes, whisking frequently. Season to taste with kosher salt before serving.