Seared tuna with lemon and lime: Stage 2

Prepare the marinade by pouring 5 tablespoons olive oil into a dish with the juice of 1 lime and 1 lemon. Add the lemon and lime zest, then salt and pepper lightly.

Put the tuna medallions into the marinade and spoon some over them, then cover with plastic film and refrigerate for at least 2 hours or overnight.