For Cake:
8 large eggs, separated
2/3 cup olive oil
2 tablespoons meyer lemon juice
1 tablespoon meyer lemon zest
2 tablespoons water
1/2 teaspoon cream of tartar
1 1/2 cups sugar
2 cups cake flour
1/4 teaspoon baking soda
1/4 teaspoon salt

For Curd:
1/2 teaspoon unflavored gelatin
1/3 cup plus 1 tablespoon meyer lemon juice
3 eggs
2 egg yolks
1/2 cup sugar
1 teaspoon meyer lemon zest
4 tablespoons butter, cut into cubes
1 teaspoon poppyseeds

For Frosting:
4 sticks unsalted butter, room temperature
3 3/4 cup powdered sugar
1/4 cup heavy cream