Why Meringue Is Dried at Low Heat Instead of Baked

By the time meringue goes into the oven, most of the work is already done. Air has been trapped in a network of egg-white proteins during whipping; the oven’s job is to set that network and evaporate the water between it. Meringue is not expected to rise like a cake or brown like bread. That is why the temperature used for meringue is much lower than for an ordinary oven recipe, and most methods stay in the 90-110°C / 195-230°F range. Running a convection oven also speeds moisture removal and shortens the time somewhat.

You can see what happens at high heat. Sugar on the outside starts to caramelize, and the meringue turns yellow and then brown, even though water is still inside. Because the outer shell hardens, steam inside cannot escape, and the meringue collapses in the center as it cools after coming out of the oven. Cracks form on the surface. A meringue that looks done in a short time is often finished only on the outside. That is why a browned meringue is not always done; its color tells you only about the surface.

At low heat, the time is longer, which is normal. Small meringues may take around an hour, while a thick pavlova base may need several hours. It is more accurate to judge doneness by the meringue itself than by the clock: it is done when it lifts easily from the parchment and its bottom is dry. If the underside sticks to the paper, there is still moisture inside and it needs to stay in the oven a little longer. Do not bake different-sized meringues on the same sheet, because the small ones may be done while the larger ones are still moist. Let the meringue cool completely before removing it from the sheet; a meringue moved while hot can split into 2 halves through the center.

Cooling is part of the process, too. Turn off the oven and let the meringue cool slowly inside for hours, with the oven door left slightly ajar. Moving it from a hot oven into a cool kitchen causes cracks from the sudden temperature change. This wait also helps the last moisture inside escape. Meringues that are rushed start to soften within a few minutes outside. A folded oven mitt can be wedged in the door to keep it ajar. This wait can continue overnight, and often gives the cleanest result.

Even the weather matters. On a humid day, meringue can come out of the oven dry but absorb moisture on the counter and turn sticky; that is why dry meringues are not made in humid weather, or are moved into a sealed container as soon as they come out of the oven. The container must close completely, and do not put warm meringue inside, because the remaining steam will condense in the container and wet the meringue. A piece of absorbent paper placed inside the sealed container also holds some of the moisture in the air for a while.