Wash the thyme, shake dry and chop the leaves into small pieces. Mix thyme and mustard. Season pork tenderloin with salt and pepper. Spread with about 1 tablespoon thyme mustard and roll in 2-3 tablespoons poppy seeds.
Peel and finely dice the shallot. Heat butter in a roaster. Add the diced shallots and place the pork tenderloin on top. Add 100 ml wine and cook in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for about 30 minutes. Remove the meat and wrap loosely in aluminium foil. Keep warm
Prepare the pasta in boiling salted water according to the instructions on the packet. Add cream, 100 ml wine, 5 tablespoons water, 1 teaspoon poppy seed and the remaining thyme mustard to the roaster and simmer for about 7 minutes. Wash the chervil, shake dry and chop the leaves of 2 stems finely. Add chervil to the sauce and season with salt, pepper and sugar. Cut pork fillet into slices. Arrange meat, noodles and sauce on plates and garnish with chervil