Preheat oven to 250°F. Draw a 9-inch circle on a piece of parchment paper. Flip the paper so ink does not get on the meringue and set aside.
Whip whites, salt, and vanilla seeds on high in a mixer until firm. With the motor running, add sugar, a spoonful at a time, until whites are glossy and very stiff.
Gently fold potato starch and vinegar into meringue with a spatula.
Gently swirl pomegranate juice into meringue creating streaks of color. Do not try to mix it in completely. You want a swirled appearance.
Transfer meringue to prepared parchment paper. Form meringue into a rustic bowl. It's not necessary to make it perfect. Just be sure to make the center thick enough to support the filling.
Bake pavlova at 250°F for 1½ hours. Turn off the oven and do not open the door for at least 6 hours or, better yet, overnight. The residual heat will crisp up the meringue and keep humidity out.
Place pavlova on a serving platter. Pile lemon curd in pavlova and garnish with berries, pomegranate seeds, and whipped cream for dairy meals.