Best Caesar Salad with Crispy Parmesan

Preheat oven to 350 degrees F. Line a large baking sheet with a silicone baking mat or parchment paper.

Place onion in a small bowl and cover with ice water. Set aside.

Spread 1/2 cup Parmesan into a 9-by-7-inch oval on the prepared pan. Bake until lightly browned and crisp, 10 to 14 minutes. Let cool on a wire rack.

Meanwhile, combine oil, egg yolk, lemon juice, garlic, anchovy, mustard, salt and pepper in a food processor (preferably a mini food processor). Process until creamy. Add the remaining 1/4 cup Parmesan and pulse to combine.

Combine romaine, spinach, kale and the dressing in a large bowl and toss to coat. Transfer to a serving platter. Drain the onion and pat dry with paper towels. Break the Parmesan crisp into large pieces and scatter over the top of the salad along with the onion.