Cut the vanilla pod lengthwise and scrape out the pulp. Caramelise the sugar in a pan over medium heat, deglaze with vinegar. Add the vanilla pulp and pod. Season with salt and pepper.
Let the caramel simmer down to half syrupy.
Cut the mango from the stone, peel and dice the flesh. Wash, clean and quarter the tomatoes. Wash, clean and shake dry lettuce. Cut mozzarella into cubes.
Layer the salad ingredients alternately in 6 glasses (each containing approx. 300 ml). Remove the vanilla pod from the reduced vinaigrette and sprinkle Trifle with the reduction.