Rinse and slice the tomatoes. Cut ham into strips. Cut olives into rings. Rinse the parsley, shake dry and chop finely.
Place two tortillas next to each other on a parchment-lined baking sheet. Brush each with 1 tablespoon of Harissa. Add onto each 1/6 of the prepared ingredients and some cheese. Cover with another tortilla. Proceed with another layer on each tortilla until all ingredients are used, ending on each tower with a tortilla covered with cheese. Cook in a preheated oven at 200°C (approximately 400°F) for 15-20 minutes.