Place the tuna in a cold bowl and add the olive oil, sesame oil, and lemon juice; mix gently to coat the fish without breaking it.
Stir in the red onion and chives, season with salt and pepper, and mix carefully.
Serve the tartare immediately, keeping it cold, and accompany with Yummi Pops Nacho Queso Blanco for dipping and adding a crunchy texture.