How to Make It
Light a grill and oil the grate. Grill the peaches, plums and citrus slices cut side down over moderately high heat until lightly charred, about 4 minutes. Transfer the fruit to a work surface When the peaches and plums are cool enough to handle, cut into wedges.
In a large pitcher, muddle watermelon until it is a course puree. Add the white wine, cranberry juice and orange liqueur. Gently stir in the grilled fruit, mint and rosemary. Serve immediately over ice.