3 rote german berry 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, white sugar, cornstarch, cold water, fresh lemon juice, vanilla extract