We will cook everything in one pan, so we take the pasta so that it goes into this pan.
Instead of broth, you can just take water.
Melt the butter in olive oil.
Cut the onion into half rings and put it in the pan.
After a few minutes, pepper and, if you want, you can sprinkle with various herbs.
Cook until brown and Golden.
Pour in about 300 ml of broth or water and spread the spaghetti.You can use short pasta. You can break the spaghetti in two if you cook it in a pot. In General, proceed from the available dishes.And a very important point. Remember that the oil has a Gorenje temperature. Don't bring it to her. Pouring water into boiling oil is life-threatening.
Cook until al dente. Salt to taste.
Add water/broth as needed. The goal is that by the time the pasta is ready, we have not broth, but sauce.