Lay the tuna steaks in one layer in a shallow baking dish and pour two thirds of the vinaigrette over them. Turn the tuna to coat well. Cover with cling film and place in the fridge for 15 minutes.
Remove the tuna from the marinade. Cook the tuna steaks for 2-3 minutes on each side, depending on how rare you like your fish. Lay the lettuce leaves onto a large plate and add the lettuce ...
For the spicy tuna and marinade you will want olive oil, cilantro steams, honey, garlic, a lime, chili powder, sea salt, and sushi-grade tuna steaks ... tacos and more fresh cilantro.