1. Melt the butter in a small pot over low-medium heat. Whisk in the flour and allow to cook for about a minute or two, while whisking.
2. Pour in 1/2 cup of the pan juices from Roast Turkey and whisk until it forms a paste. Add remaining liquid in 1/2 cup increments, whisking in between, until the gravy is smooth.
3. Allow to simmer over medium heat until thickened. Take off heat, stir in Worcestershire sauce and season with sale and pepper.
4. Cool down until the gravy thickens itself.