The Bojon Gourmet

1 In a large measuring pitcher, muddle together 1/2 cup raspberries, 1/2 cup blackberries, and 1 of the plums with the sugar until the fruit is pulverized. Add half of the wine, then strain the mixture through a fine mesh sieve and into a large punch bowl or pitcher, pressing on the fruit pulp to extract all the good stuff. Discard the pulp.
2 Add the rest of the wine, the lemon juice, rosewater, and the remaining fruit to the sangría. Taste, adding more sugar or lemon juice if you feel that it needs it. Cover and chill for an hour, or up to a day or two. (Or drink it right away if you just can't wait.)
3 Fill glasses with ice, and ladle sangría and fruit into each glass. Top each glass with a bit of sparkling water, and serve (with spoons to scoop up the alcohol-soaked fruit).