Roast the pine nuts in a pan without fat while turning them golden brown, take them out and let them cool down. Cut the melon pulp from the skin, remove the seeds and cut the pulp into 24 triangles.
Grease a grill pan with oil. Grill melon triangles in it in portions on each side for 2-3 minutes.
In the meantime, cut the feta into pieces about 1 cm thick. Wash the rocket and shake dry. Place a piece of feta between 2 melon triangles and pin it with a wooden skewer. Arrange melon sandwiches on plates.
Spread rocket on top, drizzle with a little olive oil and balsamic cream. Sprinkle with pine nuts and serve immediately.