01 - Combine tuna cubes with soy sauce, sesame oil, lime juice, and chili flakes in a bowl. Let marinate while preparing remaining components.
02 - Whisk together sour cream, lime juice, and chopped pickled jalapeños. Season with salt and pepper to taste. Set aside until serving.
03 - Preheat skillet over medium-high heat. Sear marinated tuna for 30-60 seconds per side, leaving center rare. Alternatively, serve raw for poke-style presentation.
04 - Arrange tortilla chips on serving platter or ovenproof tray. Sprinkle cheese evenly over chips and broil for 1-2 minutes until melted, if desired.
05 - Layer seared tuna, diced avocado, quartered tomatoes, red onion, jalapeño slices, and fresh cilantro over the chips. Drizzle generously with jalapeño-lime crema.
06 - Serve promptly while chips maintain crispness and toppings remain at optimal freshness.