Nut Free

The frosting can be refrigerated in an airtight container for up to 3 days. Before using, bring to room temperature; beat with the paddle attachment on medium-low speed until smooth.

The cake layers can be wrapped well in plastic and refrigerated for up to 2 days; trim the tops just before assembling.

The frosting can be refrigerated in an airtight container for up to 3 days. Before using, bring to room temperature; beat with the paddle attachment on medium-low speed until smooth.

The cake layers can be wrapped well in plastic and refrigerated for up to 2 days; trim tops just before assembling. The frosting can be refrigerated in an airtight container for up to 3 days. Before using, bring to room temperature; beat with the paddle attachment on medium-low speed until smooth. The frosting can be refrigerated in an airtight container for up to 3 days. Before using, bring to room temperature; beat with the paddle attachment on medium-low speed until smooth.

The extra tablespoon of flour, sprinkled into the center of each pastry circle, helps thicken the rhubarb juices as the tartlets cook.

If you have enough tartlet pans, use a second one over each to line the dough during baking to keep the crust from shrinking down the sides. You can also line the tartlet shells with parchment paper and dried beans; the shells will take a few minutes longer to bake.

For the smoothest, glossiest peaks, be careful not to overbeat the egg whites.

The tart shell can be made a day in advance; avoid filling it until 1 to 2 hours before you are ready to serve it in order to keep the shell as crisp and flaky as possible.