Let the oil to reach between 50 and 60 Celsius and poach your tuna between 8 to 12 minutes, (depend how big is you piece of tuna). Be very gentle to remove it and let it cool.
The fennel is been sous vide until soft and with the fennel stamp and grapes i made a delicious chutney to serve with the salad. Candied orange segments and some toasted almonds.
I believe with this dish i gave respect to the Albacore Tuna.