Slice the beef tenderloin into 1-inch thick pieces. Season both sides with salt and pepper.
In a skillet over medium-high heat, add vegetable oil and sesame oil.
Sear the beef for about 1-2 minutes on each side until browned but rare in the center.
Remove from heat and let cool for 10 minutes.
In a small bowl, whisk together soy sauce, lemon juice, orange juice, grated ginger, and honey to create the citrus soy sauce.
Once the beef has cooled, slice it thinly against the grain.
Arrange the slices on a serving platter and drizzle with the citrus soy sauce.
Sprinkle with chopped green onions and toasted sesame seeds.
Serve immediately or chill for 30 minutes for a refreshing cold dish.