Pat the steak dry with paper towels. Preheat the grill to 450°F. Clean and oil the grates to prevent sticking. Drizzle the steak with olive oil and season generously with salt and pepper.
Place the steak on the hot grill, close the lid, and cook 4 to 5 minutes per side, or until it reaches 130–135°F for medium-rare or 145°F for medium. Transfer to a cutting board, tent loosely with foil, and rest for 10 minutes. Slice very thinly against the grain.
Sandwiches
Make the aioli: Stir together the mayo, garlic, lemon juice, and lemon zest in a small bowl until smooth. Refrigerate until ready to use (flavor gets better as it sits!)
Assemble: Toast the ciabatta rolls. Spread aioli generously on the inside of both halves. Layer the bottom with arugula, avocado, sliced steak, and pickled onions. Close the sandwich and serve right away.
Video
Notes
Note 1: Find the fibers on the steak and determine how they are running along the steak. Once you find that grain, slice perpendicular (here’s a visual). This will keep the meat juicier and much more tender. It’s easier to chew when cut against the grain. If you’re near Costco, their sous vide steak is my favorite shortcut here!Storage: Best eaten right after assembling. The lemon aioli keeps up to 3 days in an airtight container in the fridge.