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Note
  • Do not substitute the bleached cake flour for all-purpose flour or unbleached flour. The high pH and starch content of unbleached cake flour will cause these cakes to collapse as well as the high protein content of all-purpose flour.
  • Club soda, seltzer water, and sparkling water can all be used. Do not use mineral water or tonic water as it contains variable sodium.
  • This batter cannot be made in advance.
  • Most marshmallow mishaps are temperature-related. The filling will be thick and rubbery if cooked to above 250°F, soft and runny if not cooled to 212°F, or impossibly thick if the syrup drops below 205°F as it cooks. Avoid these problems with an accurate thermometer.
  • Do not walk away from your thermometer while waiting for it to cool to 212°F.
  • When beating the marshmallow mixture when it is 212°F, it’s best to use a hand mixer, which is better able to whip the small quantity of syrup. If using a stand mixer, double the recipe.