In a bowl, whisk together the soy sauce, vinegar, aji amarillo paste, lime juice, grated garlic, and 2 tablespoons of parsley. Once mixed, add the sirloin and massage into the beef until well coated. Marinate while preparing the other ingredients, or up to 8 hours.
Once ready to cook, heat oil in a wok over medium high heat until wisps of smoke are visible. Remove the beef from the marinade using a slotted spoon, reserving any remaining marinade. Add the beef to the hot wok and sear until deeply browned, about 1 minute. Remove the beef using a slotted spoon.
Turn the heat down to medium and add the onion. Sear until slightly softened, tossing into the marinade left in the wok. Add the tomatoes and toss, cooking until soft. Add the steak and any remaining marinade back to the wok.
Add the fries to the wok and toss to coat in sauce. Once vegetables are softened and fries are warm, remove from the heat.
Serve over rice. Top with parsley and a squeeze of lime.