Nutritional composition and antioxidant activity of four tomato (Lycopersicon esculentum L.) farmer' varieties in Northeastern Portugal homegardens

► Portuguese tomato farmers' varieties are rich sources in antioxidant compounds. ► Round tomato proved to be the most powerful in antioxidant potential. ► Yellow tomato revealed the most interesting nutritional composition. ► They could contribute to the prevention of diseases related to oxidative stress.