Pour leftover wine into ice cube trays and freeze them. These wine cubes can be used later in sauces, soups, or stews to add flavor without diluting the dish.
Blend frozen wine with fruit juice or puree to make a refreshing sorbet or granita. Add some sugar or honey if needed and freeze the mixture in a shallow pan, scraping with a fork occasionally as it freezes to create a granular texture.
Use frozen wine cubes to chill and flavor sparkling water or club soda, creating a light and refreshing wine spritzer.
Thaw frozen wine and use it to make a reduction sauce for meats or vegetables. Simmer it gently until it thickens and intensifies in flavor, then use it as a sauce or drizzle.
Thaw the frozen wine and use it as a base for marinades or salad dressings. Its acidity and flavor can enhance the taste of meats or salads.
Thaw the frozen wine and use it as a soaking liquid for dried fruits or to poach fresh fruits, infusing them with a wine flavor.
If the wine has turned to vinegar due to freezing, consider using it as a starter for making homemade wine vinegar. Combine it with other vinegars to create unique blends.
Even if the wine has changed in taste due to freezing, it can still be used for cooking, especially in recipes where the wine flavor might be less prominent or diluted.