Wash the rosemary, dab dry and chop coarsely. Clean, wash and cut the chillies into rings. Peel and chop garlic. Mix 4 tbsp. oil, orange peel, rosemary, chilli and garlic. Wash the meat, dab dry and coat with the marinade. Cover, chill and marinate for 2-3 hours
Peel the potatoes, cut in half and cook in boiling salted water for about 25 minutes
Heat 1 tablespoon of oil in a flat roasting pan. Remove the meat from the marinade and fry it thoroughly, turning it over. Season with salt and pepper and cook in a preheated oven (electric cooker: 100 °C/ convection oven: 75 °C/ gas: unsuitable) for 25-30 minutes. Glaze with honey about 5 minutes before the end of the cooking time
Add peas to the potatoes 5 minutes before the end of the cooking time and finish cooking. Heat milk and butter in a small pot. Drain the potatoes and peas. Pour on the milk and mash with a potato masher until mashed. Season to taste with salt and nutmeg. Arrange the lamb loin on a plate. Add the mashed potatoes and peas