- 1 (3 pound) pork sirloin roast
- 1 (1 ounce) package dry onion soup mix
- 1 (16 ounce) can whole berry cranberry sauce
- 2 tablespoons butter, or to taste
- 2 tablespoons all-purpose flour, or as needed
- salt and ground black pepper to taste
- Rub pork roast all over with onion soup mix and place roast in the slow cooker. Pour cranberry sauce over roast.
- Cook on Low for 8 to 10 hours. Remove roast to a platter, reserving juices in the slow cooker.
- Melt butter in a saucepan over low heat. Whisk flour into melted butter to form a paste. Pour reserved juices from the slow cooker into the butter mixture, whisking constantly, until gravy lightens in color and thickens, about 5 minutes. Season with salt and black pepper to taste. Serve gravy alongside roast.