An apple juice glaze pairs well with vegetable and meat dishes, especially pork and chicken, as well as desserts. The juice must be cooked down and thickened to create what's known as a reduction. The glaze gets thicker as it reduces so juice that's reduced by half is thinner than juice that's reduced by three-fourths. Though bottles might be labeled specifically "apple juice" or "apple cider," you can use apple cider because it is technically the juice of an apple though usually in its freshest state.
Add apple juice to a saucepan or skillet. Use at least twice as much juice as the total volume of glaze you wish to make. Reduce the amount of juice if you want to mix sugar with the juice.
Mix brown sugar and your choice of spices with the apple juice, if desired. Though you can make a glaze reduction without sugar, brown sugar makes the glaze sweeter and thicker while adding a bit of a caramel flavor. A good ratio is to use twice as much brown sugar as apple juice. Spices are also optional, but you might want to add cinnamon, nutmeg or even basic black and pepper to increase the flavor profile.
Bring the apple juice to a boil over high heat, stirring occasionally.
Reduce the heat to simmer over medium-high heat. Simmer until the juice reduces by one-half to three-fourths and thickens to a glaze. Stir frequently to prevent scorching, especially if you add sugar to the apple juice. The amount of time it takes largely depends on the volume of juice and sugar in the pan, generally about six minutes for 3 cups of juice and sugar, but longer if using juice alone.