Soak rolls in cold water. Peel onion and garlic. Chop the onion finely, press the garlic through a garlic press. Knead minced meat, pressed bread roll, egg, onion, garlic, mustard, thyme, salt and pepper.
Clean and wash the potatoes, carrots and leek and cut them into thin slices. Grease a casserole dish and line it with half of the potato slices. Spread the minced meat on the potato layer and press it on.
Layer the remaining vegetables and potato slices in flakes on the meat. Sprinkle with thyme, salt and pepper. Pour on the stock, close the mould tightly and cook in the preheated oven (electric cooker: 200°C/ gas: level 3) for about 1 hour.
Open the mould, sprinkle the vegetables with Parmesan cheese and bake at the same temperature for 15-20 minutes. Serve garnished with fresh herbs as desired.