Make the dressing: In a small bowl, whisk olive oil, lemon juice, garlic, Dijon, salt, and pepper until glossy. Taste and adjust acid or salt.
Prep the steak: Slice cold steak thinly against the grain.
If it’s very fatty, trim a bit for a cleaner bite.
Build the base: Add greens to a large bowl. If using grains, add a warm or room-temp scoop now for a more filling bowl.
Chop the veggies: Halve cherry tomatoes, slice cucumber thin, and shave red onion. Roughly chop any herbs.
Toss lightly: Drizzle half the dressing over the greens and veggies.
Toss just to coat—don’t soak.
Add steak: Scatter the sliced steak over the top. Spoon on a bit more dressing so the meat shines.
Finish with toppings: Add cheese crumbles, nuts or seeds, and any extras like avocado or olives. A light crack of black pepper is great here.
Serve your way: Eat as a salad, pile onto toast, or wrap it in a tortilla with a smear of pesto or hummus.