Step 1

Rub sirloin steaks with vegetable oil and season with salt and pepper. Let the steaks warm at room temperature for 30 minutes.

Step 2

Preheat an outdoor grill for medium-high heat and lightly oil the grate.

Step 3

Preheat oven to 400 degrees F (200 degrees C). Prepare a baking sheet with cooking spray.

Step 4

Spread French fries onto the prepared baking sheet.

Step 5

Bake French fries in the preheated oven until slightly browned, about 15 minutes.

Step 6

While the fries bake, cook steaks on preheated grill until beginning to firm and are hot and slightly pink in the center, 6 to 8 minutes per side. An instant-read thermometer inserted into the center should read 140 degrees F (60 degrees C). Remove steaks to a cutting board.

Step 7

Mix romaine lettuce, cucumber, and egg together in a salad bowl. Pile French fries atop the salad mixture.

Step 8

Cut steaks into bite-size pieces and arrange atop the French fries. Sprinkle croutons and mozzarella cheese over the entire salad.