Grilled Steak Salad with Tomato Vinaigrette

Preparation

1. Step 1

   Season steak with 1 teaspoon salt and pepper; set aside. Grate cut sides of tomato on coarse holes of a box grater into a medium bowl down to the skin; discard skin. Add shallot and vinegar; whisk in 1/4 cup oil. Season to taste with salt and pepper. Set aside. DO AHEAD: Tomato vinaigrette can be made 1 day ahead.

   Step 2

   Build a medium-hot fire in a charcoal grill, or heat a gas grill to high. Toss spring onions in a medium bowl with 1 teaspoon oil and season with salt and pepper. Grill onions until just tender, 2-3 minutes per side. Transfer to a cutting board and cut into 2" pieces.

   Step 3

   Grill steak until seared and cooked to desired doneness, 3-5 minutes per side for medium-rare, depending on steak's thickness. Transfer to a cutting board. Let rest, about 10 minutes.

   Step 4

   Meanwhile, make croutons: Brush both sides of bread slices with remaining 4 teaspoons oil and season with salt and pepper. Grill bread until dark golden brown and nicely charred in spots, about 2 minutes per side. Set toast aside until cool enough to handle, then break toast into roughly 1" pieces.

   Step 5

   Thinly slice steak against the grain. Toss lettuces, basil, spring onions, croutons, and some of the vinaigrette in a large bowl. Season to taste with salt and pepper. Add steak and toss gently to coat. Serve with remaining vinaigrette alongside.