Swiss Meringue
Swiss meringue is the stable, sophisticated cousin of French meringue. The egg whites and sugar are heated together over a double boiler before whipping, which dissolves the sugar completely and partially cooks the whites — producing a glossy, dense, marshmallow-like meringue that holds its shape for piping and torching.
Instructions
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Combine egg whites, sugar, and cream of tartar in a large heatproof bowl. Set the bowl over a pot of gently simmering water — the bottom of the bowl should not touch the water.
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Whisk constantly until the sugar is completely dissolved and the mixture reaches 160°F on an instant-read thermometer. This takes about 3 to 4 minutes. Rub a bit between your fingers — it should feel smooth, not gritty.
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Transfer the bowl to a stand mixer fitted with the whisk attachment. Whip on medium-high speed until stiff, glossy peaks form and the bottom of the bowl is cool to the touch, about 8 to 10 minutes.
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Add vanilla and salt in the last minute of whipping.
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Use immediately for piping onto pies, topping tarts, or making meringue cookies. For baked meringue, pipe onto parchment-lined sheets and bake at 200°F for 90 minutes.