Dice the bacon. Clean and wash the liver. Clean and wash lettuce and tomatoes and drain well. Halve the tomatoes. Heat oil in a pan and fry the bacon cubes at medium heat for about 2 minutes.
Add the liver and fry for about 5 minutes, turning. Season with salt and pepper. Remove from the pan. Briefly sauté the rocket leaves in hot frying fat. Also take out and distribute on portion plates. Cut liver into bite-sized pieces and arrange with tomatoes and frisée leaves. Deglaze the dripping with stock and vinegar. Season to taste with salt and pepper. Pour the warm vinaigrette over the salad.
Also take out and distribute on portion plates. Cut liver into bite-sized pieces and arrange with tomatoes and frisée leaves. Deglaze the dripping with stock and vinegar. Season to taste with salt and pepper. Pour the warm vinaigrette over the salad. Serve immediately