Pour leftover wine into ice cube trays and freeze. Use these wine cubes to chill drinks without diluting them or add them to sauces or stews for extra flavor.
Combine frozen wine cubes with a bit of sugar and lemon juice in a blender, then freeze the mixture. Scrape it with a fork occasionally as it freezes to create a refreshing granita.
Blend frozen wine with fresh fruit, a sweetener like honey or simple syrup, and ice to create a frozen sangria or wine slushie.
Use frozen wine as a flavor booster in sauces, stews, soups, or marinades. The frozen cubes can be dropped directly into hot dishes while cooking.
Freeze wine in ice cube trays with chopped fruits like berries, peaches, or grapes. Use these wine-infused fruit cubes to chill sangria or add a flavorful twist to drinks.
Mix frozen wine with fruit juices or purees, pour the mixture into popsicle molds, and freeze. These wine-infused popsicles can be a delightful summer treat.
Incorporate frozen wine into desserts like sorbets, gelatos, or poached fruit for a flavorful twist.
If you have a larger quantity of leftover wine, consider making your own wine vinegar by allowing it to ferment with a "mother" culture or vinegar starter. It can take several weeks to several months to convert the wine into vinegar.