Heat oven to 225° F. Beat the egg whites with an electric mixer on medium in a large bowl until foamy, about 1 minute. Add the cream of tartar and beat until soft peaks form, about 1 minute more. Slowly add ¾ cup of the sugar. Increase mixer speed to medium-high and continue to beat until the meringue is glossy and stiff peaks form, 4 to 6 minutes more.
Spread the meringue in a 10-inch circle on a parchment-lined baking sheet. Bake on the bottom rack until firm and dry, 2½ to 3 hours. Turn the oven off and let the meringue cool in the oven, 1½ to 2 hours (or overnight).
Toss the strawberries, lemon zest, a pinch of salt, and the remaining 1 tablespoon of sugar in a bowl. Let sit, stirring occasionally, until the berries are juicy, 20 to 30 minutes.
In a separate bowl, whip the cream and crème fraîche until soft peaks form.
Top the meringue with the cream, followed by the berries.
This was yummy. I'd never heard of a pavlova before and enjoyed the taste combinations very much.