3 german red rote greutze Recipes

currants (assorted red fruits, in any combination) or 2 1/4 lbs raspberries (assorted red fruits, in any combination) or 2 1/4 lbs brambleberries (assorted red fruits, in any combination) or 2 1/4 lbs strawberries (assorted red fruits, in any combination) or 2 1/4 lbs sour cherries (assorted red fruits, in any combination) or 2 1/4 lbs plums (assorted red fruits, in any combination), sugar (or more to taste, depending on the tartness of the fruit), water, cornstarch, rum (optional), milk or cream, to serve with the dessert

raspberries , frozen in light syrup and thawed, strawberries , frozen in light syrup, thawed and pureed with their juice, dark sweet red cherries, stemmed pitted and quartered or 1 (20 oz) can dark sweet cherries, with juice reserved separately, natural red grape juice or 1 quart cranberry juice, sugar, lemon zest, finely grated, lemon juice, freshly squeezed, cornstarch , unsifted, dry red wine (preferably german ), heavy cream, vanilla sugar