FEATURE
Macaroon Hulls
Hollow macaron shells have a large air pocket beneath the top crust instead of a full, tender interior. Although a small gap may not affect flavor, pronounced hollows can make the shells fragile and difficult to fill.
Common Causes of Hollow Shells
- Unstable meringue: Under-whipped whites lack structure, while over-whipped whites can become dry and difficult to incorporate evenly.
- Incorrect macaronage: Under-mixed batter may retain excessive air. Over-mixed batter can lose the structure needed to support the shell.
- Baking temperature: Excessive heat can set and lift the outer crust before the interior cooks. Insufficient heat may leave the center underbaked.
- Short baking time: Shells removed too early may collapse internally as they cool.
- Uneven heat: Oven hot spots, unsuitable pans, or stacked baking sheets can produce inconsistent results.
How to Prevent Hollows
- Whip the egg whites until the meringue is glossy and holds firm peaks without appearing dry or clumpy.
- Fold the dry ingredients into the meringue until the batter flows slowly and settles back into itself.
- Pipe evenly sized shells and remove large trapped air bubbles by gently tapping the tray.
- Allow the piped shells to rest until their surfaces feel dry and no batter sticks to a lightly touched fingertip.
- Bake with an oven thermometer to confirm the actual temperature.
- Let the shells bake until their tops no longer shift when gently tested.
- Cool them completely before lifting them from the baking surface.
Troubleshooting
| Symptom | Likely issue | Adjustment |
|---|---|---|
| Large hollow with a browned top | Temperature may be too high | Reduce the temperature slightly and extend the baking time if necessary. |
| Hollow shell with a sticky base | Shell may be underbaked | Bake a little longer and cool completely before removal. |
| Tall, fragile shell | Batter may be under-mixed | Fold a few more times during the next batch. |
| Flat shell with little structure | Batter may be over-mixed | Stop folding sooner, once the batter flows in a controlled ribbon. |
After Filling
Some minor internal gaps become less noticeable after filled macarons rest in a covered container in the refrigerator. During this maturation period, moisture from the filling softens the interior and helps create the characteristic tender texture. This can improve a small hollow, but it will not fully repair a severely empty shell.