Make red wine syrup by heating red wine, vinegar, sugar and rosemary to a boil, then turn down and simmer for a few minutes. Let Cool.
Blanch tomatoes, let cool, then peel and chop.
Cut watermelon into 3 inch-long rectangles, 1 inch thick, and remove peel and seeds.
Sprinkle the watermelon with olive oil, salt and pepper. Heat a grill pan, skillet or grill on high, then place the watermelon on hot grill for 2 to 3 minutes to get some nice grill marks. Turn it over to about a minute, just to warm the other side.
On a plate, spread some basil-infused olive oil, then drizzle it with red wine syrup. Place watermelon on top.
Top with tomato concassé (blanched, peeled, seeded & chopped tomatoes), sliced radish, toasted pistachios and micro basil.