In a saucepan, combine wine, water, sugar, ginger, cinnamon, nutmeg, cloves, coriander, and salt. Bring to a gentle simmer over low heat for 10–15 minutes, stirring occasionally.
Strain the mixture to remove the spices and return the liquid to the pan.
In a small bowl, bloom the gelatin powder in a few tablespoons of cold water for 5 minutes.
Stir the bloomed gelatin into the hot spiced wine mixture until fully dissolved.
Pour the liquid into your desired mold (bonus points for a Tudor castle shape) and refrigerate for at least 6 hours, preferably overnight, until set.
Unmold carefully and serve chilled.