Clean, wash and cut the salad into strips. Wash, quarter, seed and slice the tomatoes. Peel onion and cut into small cubes. Season vinegar with salt and pepper, add oil.
Add onion. Mix the lettuce and tomatoes and pour the vinaigrette over the lettuce. Cut the camembert into wedges. Heat the remaining oil in a frying pan. Turn the camembert first in the milk, then in breadcrumbs and pour into the hot oil.
Fry for about 2 minutes while turning. Arrange camembert, salad, pumpernickel and cranberries on a plate and serve immediately.