Separate the egg whites and put them into the mixer bowl.
In a heavy bottom pot, add the water and almost all the sugar, except for about 2 oz. Add the remaining sugar to the egg whites.
Cook the sugar and water to 245ºF, or if you're at high altitude, about 238ºF. Have the pastry brush and bowl of water near the stove. Stir the sugar and water until the sugar is mostly dissolved. Dip the pastry brush in the water and run it around the inside of the pot to dissolve any crystallized sugar. Continue doing this.
Turn the electric mixer with the egg whites on high, so that when the sugar mixture reaches the right temperature the egg whites will be at soft peaks. I usually turn it on when the sugar mixture reaches 200ºF.
When the sugar mixture reaches the right temperature, and the egg whites are at soft peaks, take the pan over and SLOWLY pour the sugar mixture down the side of the bowl into the egg whites while the mixer is still whipping the egg whites. If you pour too fast the egg whites will curdle. Avoid spilling the sugar mixture on the whisk, or you'll get hard chunks in your buttercream.
Once the sugar mixture is completely poured into the egg whites, turn the mixer down to low until the meringue is completely cool. About 20 minutes.
Once the meringue is completely cooled, slowly add the butter at medium speed, one piece at a time until completely incorporated.
Turn the mixer up to high and mix until the butter is emulsified. The buttercream will look like it's separating, but keep mixing it. Once it comes together again, mix it on high for about 5 minutes.
At this point you can make any variations to the recipe. Or just use the buttercream.
Variations: Spiced Buttercream-Add cinnamon, cloves, nutmeg, and ginger to taste.
Chocolate Buttercream-Melt bittersweet or semisweet chocolate over a bain marie. Add just enough chocolate so you can taste it, but the buttercream still retains its stiffness. After you add the chocolate you'll need to whip the buttercream until it's at soft peaks again.
Refridgerate any buttercream.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	640.62 Kcal (2682 kJ)
Calories from fat	413.25 Kcal
		% Daily Value*
Total Fat	45.92g	71%
Cholesterol	121.88mg	41%
Sodium	54.29mg	2%
Potassium	60.95mg	1%
Total Carbs	56.98g	19%
Sugars	56.98g	228%
Protein	3.69g	7%
Vitamin A	0.6mg	19%
Calcium	18.3mg	2%

Amount Per 100 g
Calories	393.02 Kcal (1645 kJ)
Calories from fat	253.53 Kcal
		% Daily Value*
Total Fat	28.17g	71%
Cholesterol	74.77mg	41%
Sodium	33.31mg	2%
Potassium	37.39mg	1%
Total Carbs	34.96g	19%
Sugars	34.96g	228%
Protein	2.26g	7%
Vitamin A	0.3mg	19%
Calcium	11.2mg	2%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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