In a small bowl, soak the mustard seeds in the wine at room temperature overnight.

Wrap the cinnamon stick, ginger and cloves in a piece of cheesecloth and tie closed. In a saucepan, whisk the mustard seeds, wine, sugar, vinegar, cranberry juice and mustard powder and bring to a boil. Add the spice bundle and cook over moderate heat, without stirring, until the syrup coats the back of a spoon, 25 minutes. Discard the spice bundle. Stir in the cranberries and orange zest and let the mostarda cool completely. Season with salt and serve; stir in water by the tablespoon if it seems too thick.