Peel and chop the onion. Wash the thyme, shake dry and remove the leaves from the stems. Mix maple syrup and lemon juice, season with salt, chilli and thyme. Wash the meat, dab dry. Heat oil in a pan. Sauté the meat for approx. 3 minutes while turning it over
Place the meat in an ovenproof dish and coat all around with the prepared marinade. Cook in the preheated oven (electric cooker: 150 °C/ convection oven: 125 °C/ gas: level 1) for approx. 15 minutes
In the meantime, peel, wash and roughly dice the sweet potatoes. Cook in boiling salted water for about 15 minutes until soft
Fry the onion cubes in the frying fat for about 4 minutes while turning. Dust with flour and deglaze with stock while stirring. Bring to the boil and stir in cranberries. Season to taste with salt and pepper. Keep sauce warm
Drain the potatoes and collect the liquid. Add butter and 200 ml cooking liquid to the potatoes and mash the potatoes finely. Arrange meat, sauce and puree