How Do You Thicken Red Wine Gravy?
To thicken red wine gravy, you can add a slurry made from equal parts of cornstarch or flour and water. Mix the slurry together and slowly whisk it into the boiling gravy until it thickens to your desired consistency. Another option is to simmer the gravy for a longer period of time to allow it to naturally thicken, or add a small amount of roux (a mixture of butter and flour) to the gravy while it cooks to help it thicken.