Step 1

Heat the olive oil over medium heat in a thick-bottomed pot with a lid. Add the onions, garlic, and crushed red pepper flakes. Saute the ingredients for 3 minutes.

Step 2

Add the potatoes, chopped tomatoes, broth, wine, and vinegar. Mix the ingredients well, then bring the liquid to a boil.

Step 3

Add the sage, salt, and pepper. Cover the pan and simmer the mixture on low heat, stirring occasionally, for 10 to 15 minutes, until the potatoes are tender when pierced with a knife.

Step 4

Stir in the parmesan cheese and basil, and simmer the mixture for a few more minutes to allow the flavors to blend. Add more salt and pepper if needed.