For the vinaigrette
Rinse and dry the lettuce. Rinse and delicately dry the blackberries. Wash the celery and cut into thin slices. Cut the cheese into cubes. Put the salad mix and the blackberries in a bowl. Top with the celery, cheese, bresaola and pumpkin seeds. Prepare the vinaigrette by emulsifying the oil with the vinegar, salt and pepper. Use the emulsion to dress the salad. Serve immediately.