Place tuna, avocado, and red onion in a large bowl. In a small covered container, toss together vinegar, soy sauce, canola oil, sesame seeds, salt and pepper, then pour dressing over tuna and toss lightly to coat well. Refrigerate tuna tartare until ready to serve. Just before party, place a small spoonful of tuna tartare into Asian soup spoons and serve immediately.
Recipe by Cooking With MicheleĀ® at https://cookingwithmichele.com/2008/12/fancy-appetizers-made-easy/