In a medium bowl, whisk together soy sauce, brown sugar, sesame oil, garlic, and ginger to create the marinade.
Place the sliced steak in the marinade and refrigerate for 30 minutes to allow for enzymatic tenderization and flavor penetration.
In a separate small bowl, combine mayonnaise, Sriracha, and lime juice to create the spicy cream sauce; whisk until emulsified.
Heat a heavy cast-iron skillet or wok over high heat with a neutral high-smoke point oil.
Add the steak to the skillet in a single layer and sear for 2 to 3 minutes until the exterior is caramelized via the Maillard reaction.
Divide the steamed jasmine rice into four individual serving bowls.
Layer the seared steak, shredded carrots, and sliced cucumbers onto the rice base.
Apply a uniform drizzle of the spicy cream sauce over the assembled ingredients.
Garnish with sliced green onions and toasted sesame seeds to provide textural contrast and aromatic finish.