Chef John shows us in this version pairs the silky texture of the fresh tuna, with the sweet, vibrant flavor of mango, and the smooth richness of avocado. It's dressed very simply with rice vinegar, soy, and lime. We also cut our tuna into a small dice so we can present it molded into small ramekins. This is simple to make, and a great, light, first course to any dinner. You will need Ahi tuna steak, mango, avocado, minced ginger, lime, chili paste or hot sauce, rice vinegar and soy sauce.