Heat oven or toaster oven to '275F. Spread walnuts on a baking tray and bake until fragrant and lightly browned, about 10 minutes. Roughly chop nuts.
Place oil, lemon juice, and a pinch of salt and pepper in a jar with a lid. Close tightly and shake vigorously to combine.
Place lettuce and pear slices in a mixing bowl. Season with salt and pepper, add dressing and toss. Divide among plates, sprinkle cheese and nuts on top, and serve.
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