Mix mustard, cranberry juice and salt. Whip olive oil into it. Add cranberries and fold in.
Form balls from the galia and watermelon with a ball cutter. Coarsely crumble the feta cheese. Roast the walnuts in a pan without fat and chop them coarsely. Wash the salad and spin dry.
Mix all ingredients together and serve sprinkled with dressing. Roasted baguette tastes good with it.