Sesame Wonton Crisps: Preheat oven to 350°F Line a baking sheet with parchment paper. Cut the wonton squares on an angle to make two triangles. Arrange the wonton triangles on the baking sheet. Spray with olive oil on one side (or brush lightly). Sprinkle lightly with sesame seeds. Bake until golden, about 6 minutes. (Can burn easily so watch carefully). Let cool. (Alternatively, if you want cups, put the oiled whole wrappers in mini muffin tins). Remove triangles from the pan and let cook on a cooling rack.
Tuna Tartar: Mix tuna, green onions, sesame seeds, soy sauce, sesame oil, ginger, garlic, orange zest, cilantro and salt together in a medium bowl. Mix well.
Assembly: Right before ready to serve, add the avocado and lime juice. (Do not mix in advance.) Place a heaping teaspoon of the tuna mixture on each wonton triangle. Garnish with a sprig of cilantro. Serve immediately. It is important that the tuna is not left at room temperature for more than 1 hour.