Sort the spinach, wash and drain. Place the tortelloni in plenty of lightly boiling salted water and leave to stand for about 15 minutes. Add the spinach in the last 1-2 minutes. Pour the finished tortelloni and spinach onto a sieve and drain
Peel and finely dice the shallot and garlic. Melt the fat in a pot and sauté the shallot in it. Add flour, sweat briefly while stirring and pour on stock while stirring. Bring to the boil and simmer for about 5 minutes. Wash oregano, shake dry and chop the leaves. Turn off the heat, stir the cream cheese and oregano into the sauce and season with pepper
Add the tortelloni and spinach to the sauce. Wash the tomato, dab dry and cut into slices. Line a casserole dish with the tomato slices, season with salt and pepper. Pour the tortelloni mixture onto the tomatoes. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 20 minutes.