Clean and wash the salad, pluck into bite-sized pieces and drain well. Peel and finely dice the shallot. Wash the liver, dab dry and cut into slices. Heat the fat in a pan and fry the liver slices until golden brown, turning them over.
Season with salt and pepper. Add shallots, 2-3 tablespoons of water, vinegar and walnut oil. Bring to the boil briefly and season to taste with salt and pepper. Remove from heat and add the cranberries. Arrange the salad on plates and arrange the lukewarm liver pieces with the sauce on top.
Serve immediately.