Cut tuna into 1/4-inch chunks with a very sharp knife, trimming away any dark, bloody parts. Coarsely chop tuna by hand until it begins to hold together. Transfer to a bowl over a bowl of ice. Add garlic, olive oil, sesame oil, anchovy, basil, celery, ginger, salt and pepper; combine well. You can chill patties for up to six hours until ready to cook.