Donal Skehan's Lemon Marshmallow Cake

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Ingredients:

Lemon Marshmallow Cake

Serves 8

For the cake and filling:
1 3/4 cups (8 ounces) all-purpose flour, plus more for dusting
2 1/2 teaspoons baking powder
3/4 teaspoon salt
3 large eggs, at room temperature
Finely grated zest and juice of 1 lemon (about 4 tablespoons)
1 1/2 sticks (6 ounces) unsalted butter or margarine, at room temperature, plus more for greasing
3/4 cup plus 2 tablespoons (6 ounces) superfine sugar
27 jumbo marshmallows (about 7 ounces)
Lemon curd for filling, store-bought or The Pleasures of the Table: Rediscovering Theodora Fitzgibbon.