Wash the meat, dab dry and season with salt. Heat the oil in a pan and fry for about 5 minutes, turning the meat well. Wash the tomatoes. For the sauce, bring cream and processed cheese to the boil.
Wash the chervil, shake dry, pluck the leaves from the stems and chop finely, except for something to garnish. Season sauce with salt and pepper. Stir in 2/3 of the chervil. Coarsely grate the cheese.
Mix the remaining chervil and cheese. Place the meat and tomatoes in a greased casserole dish and pour the sauce over them. Spread the cheese over the meat. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 30 minutes.
Garnish with chervil.