Onion, carrots, celery and garlic are roasted with tomato paste, simmered in broth with herbs, strained and thickened with a golden roux. Chill or freeze the finished gravy, then reheat it on the day with or without turkey drippings.
Makes about 4 cups (16 servings of 1/4 cup). Refrigerate for up to 2 days or freeze for 2 to 3 months; thaw frozen gravy in the fridge. Reheat with a splash of broth, whisking, until it comes to a boil.
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Find it online: https://gordonramsayeats.com/make-ahead-turkey-gravy/