When I fry/roast my meat I remove it and to the juices and fat I whisk in a tablespoon of buckwheat flour and continue to whisk on low heat until it thickens.
If it is too thick just add a little water or premade stock if available and then just season to taste with salt, pepper and whatever herbs you prefer, like finely chopped mint and garlic for lamb for eg. or coriander for chicken...........
Hope this helps. Bon apetit :)