Option 1: Classic tartare — Mix the tuna, avocado, onion & jalapeno with the sauce, stirring just to combine. Be gentle when mixing to prevent ingredients (i.e. avocado) from getting messy.
Option 2: Sharing plate — A trendier take on the dish, start by placing the tuna cubes in the center of a large plate. Then, top with avocado, green onion and jalapeno, in that order. Pour sauce on top just before serving.
Option 3: Appetizer bites — Follow the same instructions as #2 (i.e. mix all together), and then separate into individual serving spoons, mini appetizer bowls / plates or toasted pitas for some crunch.