Wash the thyme, shake dry. Pluck the leaves from the stalks and chop them, except for a little to garnish. Peel garlic and chop finely. Peel and wash potatoes and beetroot and slice or cut them into very thin slices (beetroot is best done with gloves!). Mix with garlic, chopped thyme, oil, 1 tsp salt, 1/2 tsp pepper and 1 pinch of sugar in a bowl
Grate cheese. Spread the potato mixture in a greased casserole dish. Sprinkle with cheese. Place on the oven rack, cover with aluminium foil and bake in a preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 50 minutes. Remove the foil and bake for another 20-25 minutes until brown
Meanwhile, roast pumpkin seeds in a pan without fat for 3-4 minutes, remove. Take out gratin, sprinkle with pumpkin seeds and garnish with thyme
Suitable as a side dish for e.g. fillet steaks or braised meat