Wash the potatoes and cook in boiling water for about 20 minutes. Drain, rinse with cold water and peel. Let cool down. Wash, clean and halve the tomatoes. Wash the rocket, dab dry and clean.
Stir mustard and honey together until smooth. Remove 6 tablespoons and put aside. Stir the remaining mustard-honey mixture first with vinegar, then the oil. Season with salt and pepper. Mix marinade with potatoes, tomatoes and rocket. Wash and clean the zucchini. Peel long strips with a peeler. Wrap around the sausages. Spread the marinade on the sausages. Grill on the hot grill for about 10 minutes, turning from time to time.
Wash and clean the zucchini. Peel long strips with a peeler. Wrap around the sausages. Spread the marinade on the sausages. Grill on the hot grill for about 10 minutes, turning from time to time. Serve the sausages with potato salad. Garnish with marjoram