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Okay, I live in Northern California and it really does not get hot until July Aug Sept. I appreciate your information. It sounds like I can leave it out for a pretty good length of time as long as it is maybe not over 80?
I'm in Northern California also. So far I have had great luck with IMBC it's all I use. Provided your buttercream is not to thick under the fondant it holds up pretty well. But again on especially hot days July August you'll want to be a little more careful watching the temp of the cake. And always keep it out of direct sun.
Where in Nor Cal are you? I'm in Santa Rosa, Sonoma County!
I think I have seen 80-84 listed as appx temps that it can endure. Supposedly it is a little more stable than Swiss buttercream. I too like to keep it chilled until the cake is ready for display but then I prefer that it sit out for at least an hour to soften up for eating. Some people swear that it is allowed to remain at room temp for at least 3-4 days but I always refrigerate to store. As for food safety, if the egg whites have been cooked to safe temp, then that doesn't matter - that particular dead bacteria is now dead. Think of it in terms of the cake itself: there are eggs and often milk in your cake...however it doesn't usually require refrigeration. That said, I'm paranoid about food safety so I actually always use pasteurized ew from the carton; there is much debate on the internet as to whether or not the sugar syrup truly heats the ew to safe temp so I err on the side of caution, especially since so many of my cakes are for baby showers or are eaten by kids.
I am in SoCal and use IMBC all the time - in NoCal I think you will be totally OK. If it's a hot, hot day, just try to keep the cake inside, or else in a cooler or something.
Hi Marnee
This is the recipe I use it's originally from "The Cake Bible" by Rose Levy Beranbaum. It does call for cream of tartar which I think just helps with whipping the egg whites. I've included the whole recipe as it's written but added a few of my own notes in ((( ))).
It makes 4 1/2 cups of delicious creamy not to sweet frosting. I love it...enjoy
2 Cups unsalted butter (((be sure to use unsalted or your frosting will have a salty taste)))
1 cup sugar
1/4 cup water
5 large egg whites
1/2 + 1/8 teaspoon cream of tartar
3 fluid ounces liqueur or other liquid
In a mixing bowl beat butter until smooth and creamy and set aside in cool place.
Have ready a heated glass measuring cup near the range. (((I don't use the measuring cup because I find the sugar cools to quick for me in it so I pour from the sauce pan but do what works best for you)))
In a small heavy saucepan heat 3/4 cup sugar and 1/4 cup water, stirring constantly, until the sugar dissolves and the mixture is bubbling. Stop stirring and reduce the heat to low.
In another mixing bowl beat the egg whites until foamy, add the cream of tartar, and beat until soft peaks form. Gradually beat in the remaining 1/4 cup sugar until stiff peaks are formed.
Increase the heat and boil the sugar syrup until it reaches 246 degrees. Immediately pour into the glass measure cup. Beat syrup in several additions without letting it fall directly on the beater stopping mixer to pour in syrup additions. (((if you are using a hand mixer which I do you don't have to stop it just be sure not to hit the mixer with the sugar as you pour it in this is so it doesn't spray the sugar around your bowl. If you do you will end up with hard sugar balls in your frosting))) beating on high for 30 seconds before adding more syrup. Beat on high speed for up to two minutes to completely cool.
Beat in the butter at medium speed 1 tbs at a time. It will appear thin but thicken as all the butter is added. If it looks curdled, increase the speed slightly and beat until smooth before adding more butter. Drizzle in flavoring at the end on low speed.
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