(Solanum Lycopersicum)
HEIRLOOM. 
80 days. 
This huge heirloom beefsteak (up to 1.5 kg; average 1.1 kgs) consistently wins taste-tests. 
Developed in the 1930's by a gardener who planted the four biggest varieties he knew and crossed one with pollen from the other three. 
He did this for six seasons and created a variety that produced immensely tasty fruit.