01 -
Combine pumpkin puree, water, sugar, and pumpkin pie spice in a medium saucepan. Cook over medium-low heat for 10 minutes, stirring frequently until ingredients are well incorporated. Remove from heat and allow to cool.
02 -
Layer 2 to 3 sheets of cheesecloth inside a fine mesh strainer and set strainer over a bowl or measuring cup to collect strained liquid.
03 -
Add one-quarter to one-third of the cooled pumpkin mixture to the strainer. Press the mixture gently with a spoon against the cheesecloth to extract as much liquid as possible. Avoid squeezing the pulp to prevent solid bits from passing through. Discard remaining pulp and repeat with remaining mixture until approximately 360 ml of liquid is collected.
04 -
Clean the saucepan, then return the strained pumpkin liquid to it. Add apple juice and vanilla extract, simmer over low heat, and reduce mixture to about 960 ml, approximately 10 minutes.
05 -
Pour the juice into a storage container and cool to room temperature. Refrigerate and serve chilled over ice or warm as desired.