Place the tuna in a nonreactive bowl with the scallions, 1 teaspoon of the chili oil, the sesame oil, 1/2 teaspoon of the black sesame seeds and 1/2 teaspoon of the white sesame seeds. Sprinkle over the smoked paprika and season with salt. Mix together, and then refrigerate.
Slowly brown the melted butter in a pan over low heat. Brush some onto a single layer of filo, and then fold in half. Brush another layer with butter, fold in half, and place on top. Repeat with the third layer. Cut the filo stack in half on a bias, and then bake on a baking sheet until crispy, about 5 minutes. Season with salt.
Mix the Dijon with the remaining chili oil, incorporating well. Swipe some spicy Dijon on a plate, with 1 tablespoon of the tuna on top. Place a layer of filo over, and then top with another tablespoon of tuna and another filo layer. Finally top with one last tablespoon of tuna. Top the napoleon with the red onions, cilantro and the remaining sesame seeds.