Beat the eggs and 1⁄3 cup sugar until light and fluffy, about 3 minutes. On low speed, mix in the flour, cream, vanilla extract, lemon zest, salt, and pear brandy. Set aside for 10 minutes.
Meanwhile, peel, quarter, core, and slice the pears. Arrange the slices in a single layer, slightly fanned out, in the baking dish. Pour the batter over the pears and bake until the top is golden brown and the custard is firm, 35 to 40 minutes. Serve warm or at room temperature, sprinkled with confectioners' sugar, and creme fraiche!