Wash and drain the spinach. Wash the meat, dab dry and cut into slices. Prepare pasta in boiling salted water according to package instructions. Heat 1 tablespoon of oil in a coated pan.
Fry the meat for 4-5 minutes on both sides, season with salt and pepper. Peel and finely chop the onion. Heat 1 teaspoon of oil in a saucepan and sauté the onion. Cut the gorgonzola into cubes.
Pour stock and cream while stirring to the onion and bring to the boil. Add cheese and melt in the hot liquid at low heat while stirring. Simmer for about 2 minutes, stirring occasionally.
Drain the pasta, let it drain and put it back into the pot with the spinach. Add the sauce and meat immediately. Season to taste with salt and pepper and serve.