To prepare a tart lemon roulade recipe, you'll first need to gather your ingredients. Cut the lemons in half lengthwise, then cut each half into quarters. Place the quartered lemon halves into the bowl of ice cream maker. Pour in the melted butter and mix until the mixture is smooth. Add the confectioners' sugar and beat until it's light and fluffy. Set aside to cool. In the mixing bowl, combine the flour, baking powder, sugar, and salt. Gradually add the dry ingredients, mixing until they're just combined. Spoon the batter into an oiled 9-inch tart pan and bake for 20 minutes. Remove the pan from the oven and let it cool for 5 minutes before serving.