Turn zucchini and onion over with a spatula to cook other side. Onion and zucchini should start to become carmelized. Continue to cook covered on medium high heat for 10 minutes.

Turn vegetables over. Add salt. Take care not to burn. Reduce heat as needed. If burning does occur, add small amount of water to deglaze pan and continue. Flavor is enhanced by this process nonetheless.

Cook covered for another 5 minutes. Turn vegetables over and top with parmesan cheese. Cover. Cook on low for 5 minutes then turn off heat and let sit on stove until cheese melts or when ready to serve.