Chop the onions into fine cubes and sauté them in olive oil. After 1 - 2 minutes add the garlic, sage leaves and chilli pepper. Here you can decide according to taste whether you want to chop individual or all three ingredients (more intense taste) or whether you put them whole in the pot.
Cook the pasta in plenty of salted water until al dente.
Add the tomato paste to the onions in the saucepan and distribute well. Deglaze the sauce with 1 1/2 cl olive oil and a good dash of white wine. Season with salt, pepper and oregano and let simmer.
Now put the shrimp in a pan with plenty of oil and sweat with the juice of half a lemon, but do not fry until brown. Add the shrimp and oil to the pan and season to taste again.
Drain the pasta, add to the sauce and fold in. Serve and decorate with basil and grated parmesan if necessary.