01 - Combine diced tuna cubes with soy sauce, sesame oil, lime juice, and chili flakes in a bowl. Let marinate while preparing remaining toppings.
02 - Whisk together sour cream, lime juice, and chopped pickled jalapeños until smooth. Season with salt and pepper to taste. Set aside for serving.
03 - Preheat skillet over medium-high heat. Sear marinated tuna for 30-60 seconds per side, leaving center rare. For poke-style presentation, skip cooking and serve raw.
04 - Arrange tortilla chips on serving platter or ovenproof tray. Sprinkle shredded cheese evenly over chips. Broil for 1-2 minutes until melted and bubbly, if desired.
05 - Layer seared tuna over chips. Top with diced avocado, quartered cherry tomatoes, red onion, jalapeño slices, and fresh cilantro. Drizzle generously with jalapeño-lime crema.
06 - Serve while chips remain crispy and toppings are fresh. Best enjoyed immediately after assembly to maintain texture contrast.