Wash the potatoes and cook in boiling water for about 25 minutes. In the meantime cut the peppers in half, clean and wash them. Place on a baking tray with the cut surface facing down. Grill under the hot oven grill for 8-10 minutes until the skin turns black and blisters. Remove and immediately put the peppers in a freezer bag. Close the bag, let the peppers cool down
Whisk mustard with honey and 4 tablespoons vinegar, season with salt and pepper. Fold in 5 tablespoons of oil in a thin stream, season to taste again. Wash the rocket, dab dry and clean. Put some leaves aside, chop the rest roughly
Drain the potatoes, rinse with cold water and peel. Leave to cool. Drain capers. Peel the skin off the peppers, chop the peppers into small pieces. Cut potatoes into slices. Whisk 2 tablespoons vinegar and 2 tablespoons oil, mix potatoes with it. Arrange potato slices decoratively on plates or a large platter. Sprinkle with paprika, capers and rocket. Garnish with rocket leaves. Drizzle vinaigrette over it