In an open cooker, melt the butter then add the onions and
turkey. Fry until brown on all sides.
Add the stock, parsley, wine, half of the grapes then salt and
pepper.
Close the cooker and bring to high pressure. Cook for 12 minutes
then reduce the heat right away.
Lift out the turkey from the cooker. Discard the parsley and set
aside the turkey. Keep hot.
To make the paste, mix the flour with butter. Divide it into
small pieces and stir it into the cooking liquid. Cook and stir
constantly until the sauce thickens.
Place the remaining grapes to the cooker and cook for 2 minutes.
Stir in the cream. Adjust the seasoning and taste.
Pour the sauce on the turkey and serve.
Note: Reduce the cooking time to 8 minutes if using turkey breasts.