How to make swiss meringue buttercream

Swiss Meringue Buttercream
400 Grams egg whites
510 Grams sugar (extra fine if possible)
600 Grams room temp. unsalted butter
250 Grams vegetable shortening
optional flavorings below
Put egg whites and sugar into the bowl of your stand mixer (make sure it's heat proof) - whisk them like you mean it and combine the sugar into the egg whites.
Place the bowl onto a pot with an inch of simmering water and continue to stir them every few minutes while heating for about 10-15 mins until you can carefully dunk your fingers into the bowl to feel for any sugar granules between your thumb and index finger. You don't want a gritty buttercream so make sure all the sugar is dissolved.
Transfer the bowl onto the mixer with the whisk attachment and whisk until the meringue is a very stiff peak. This takes a while so don't rush it. sip some coffee and let it do its thing.
Ok when you are certain your meringue is stiff enough, start adding your fats a little blob at a time, your meringue is going to fall and look soupy and curdled (PANIC) just kidding, this is normal, keep adding the fats until they are all in.
Add vanilla extract now if using and continue to whip until the curdled mess comes together into silky smooth buttercream.
If your using the buttercream now I recommend switching to a paddle just for a minute to knock out the excess air bubbles before you frost your cake. If your icing cupcakes or using this for something else than you can skip this.
If you're making this ahead of time (good for you) than you can store it at room temp over night or in the fridge for 7 days (bring to room temp over night before you use it, it will be hard like butter in the fridge) or freeze for 6 months,
In my video I used a 6qt mixer and made 1.5x this batch. This recipe will about 4lbs of buttercream which if you need a visual is enough to fill about half way up a gallon Ziplock bag. If I am frosting and filling a 7" 3 layer cake than I'll always make the 1.5x batch and freeze any extra if I have.
Flavors:
Vanilla - 2 teaspoons vanilla extract
Lemon - 1.5 teaspoon vanilla extract & 1 cup lemon curd
Oreo - add 1-2+ cups finely ground Oreo cookies depending how Oreo you want it - also add 2 teaspoons vanilla.

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Looks yummy. Definitely going to try your recipe!