Flambé 75 ml of and 100 ml of white wine to release the alcohol.
When the alcohol has evaporated, add a little pepper and 50 ml of vegetable stock and cook over low heat for 6 minutes to release the aroma. If the water content is low, add water. *The amount of bouillon depends on its thickness.
If you think the aroma of the pepper is not strong enough, leave it in and let it stand. Strain when the time is right. This will form the base of the sauce.
Strain and add the roasted gibier jus and bring to a simmer. If it is not thick enough, connect it with butter.