Adjust oven rack to middle position and heat oven to 400 degrees. Lay naan directly on oven rack and bake until well heated, about 5 minutes. Meanwhile, mix cream cheese with onion, capers, dill, and lemon zest; set aside.
Shortly before serving, spread a portion of cream cheese over each naan and top with smoked salmon. Wrap in foil until ready to serve.
Notes
To quickly soften cream cheese, remove it from its packaging and microwave on high power for 30 seconds. Cut the zested lemon into eighths and pack it for the picnic for squeezing onto the pizza. You may also want to pack up some extra dill for garnish.
Recipe by Three Many Cooks at https://threemanycooks.com/recipes/meaty-mains/smoked-salmon-flatbread-pizzas/