Wash the tarragon, shake dry, remove leaves except for a little garnish, pluck from the stalks and chop finely. Mix mustard and tarragon and season with salt
Wash the meat, dab dry and season with salt and pepper. Rub tarragon mustard all around and sprinkle with breadcrumbs. Roast in a roaster in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 3 hours. Cover with aluminium foil after approx. 2 hours
Peel the carrots, leaving a little green. Clean and clean the mushrooms and cut them in half depending on their size. Clean and wash spring onions and cut them into pieces of about 4 cm length. Peel and roughly chop the garlic. Season prepared vegetables with salt and pepper and spread around the roast about 45 minutes before the end of the frying time. After about 15 minutes pour on apple juice
Remove the finished roast and let it rest for a short time. Arrange vegetables and roast and garnish with tarragon