Rum (Meringue) Buttercream

  • 2 cups spiced rum
  • 3 egg whites
  • 8 oz sugar
  • 1/4 cup water
  • 1 tsp light corn syrup
  • 1 1/2 cups (2 1/2 sticks) butter, room temp and cut into small pieces
  • 2 tsp cinnamon
  • 1 tsp vanilla
  • 1/4 cup eggnog (optional)


1. Add the spiced rum to a small saucepan. Heat until boiling over high heat. BE CAREFUL and watch closely - rum is very flamable. You might accidentally set the rum on fire (flambé) - carefully remove the pan from heat and put the lid over the top for a few seconds. Once extinguished, return to the stove top.  Cook until you have 3-4 tbsp. of liquid. Cool completely.

2. Here you have to be coordinated - it helps to have your mixer near your stove, if possible. In a medium saucepan, combine the sugar, water, and corn syrup. Attach a candy thermometer to the side of the pan. Over high heat, boil the mixture until it hits 'soft ball' stage, or 235 - 240°.

3. While the sugar mixture is coming to temperature, add the egg whites to your stand mixer (make sure your bowl and whisk attachment are grease-free by wiping down with lemon juice/vinegar). On medium/medium-low speed, whip your egg whites to a soft peak. (Ideally, you want the sugar temperature to hit 235° at the same time your eggs hit a soft peak.)

4. With the mixer on high speed, carefully, slowly, pour the sugar mixture into the mixer bowl. Try and hit the very edge of the egg whites with the stream of sugar without hitting the beater. Whip on high speed until the mixture is room temperature and you have stiff peaks. Wrapping your mixer bowl with ice packs will speed up this process.

5. Slowly add the butter, once piece at a time until all incorporated. Add the egg nog, cinnamon, vanilla, and cooled rum. Beat until well mixed and the frosting has a smooth texture. (Sometimes I switch to the beater attachment to create a smooth texture here.)

Source: Savory Simple's Eggnog cupcake recipe