Pimiento cheese is a Southern tradition. We add a little Parmesan to the standard cheddar-mayo mixture for extra savory depth.
Combine first 7 ingredients in a large bowl. Spread 3 tablespoons cheese mixture on each bread slice; top each with 3 tomato slices. Sprinkle tomato slices evenly with salt. Top each sandwich with 2 bacon halves and 1/4 cup arugula.
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