Measure out and prepare all the ingredients. Preheat the grill for about 20 minutes on low heat.

Cut the lettuce head in half. Brush both sides of the lettuce with half the olive oil.

Place lettuce on the grill and grill for a few minutes on each side while leaving the grill lid open. Grill until the outer leaves are charred.

Shave the manchego cheese with a vegetable peeler or sharp knife. Chop the lettuce and prosciutto up into bite-sized pieces.

In a bowl, combine the lettuce pieces with the rest of the olive oil, mayonnaise, and lemon juice. Toss to combine.

Top the salad off with the prosciutto and manchego. Season with salt and pepper.