Step 1Spray a small skillet with cooking spray and place it over high heat. Add the pumpkin seeds and sprinkle lightly with salt. When the first pumpkin seed pops, after about 50 to 60 seconds, stir the seeds until they are slightly browned, 1 minute. Set the seeds aside on a paper towel.
Step 2Mix the shallot, vinegar and salt and pepper to taste in a small bowl. Whisk in the oil.
Step 3Place the lettuce in a bowl. Scatter the tomatoes and pepitas over the lettuce. Drizzle with dressing.