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Before you start, get all of the ingredients ready. Prepare two piping bags, fitted with round tips, I am using a tip number 3 for the stem and a tip number 8 to pipe the shamrock leaves. The stem is smaller and thinner than the leaves, so you will need a smaller tip for that.
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Line two baking sheets with parchment paper or silicone mat. Place the template under the mat.
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Measure out all of the ingredients.
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Sift the powdered sugar and almond flour together. Set it aside.
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Place a bowl over a pan with barely simmering water. Add the sugar and egg whites to the bowl and whisk the mixture until frothy and the sugar is completely melted. It will take a couple of minutes. You can test by touching the mixture between your fingers, and if you feel any sugar granules just keep whisking the mixture over the water bath.
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Make sure the bottom of the bowl isn’t touching the simmering water because you don’t want the whites to cook.
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Also, don’t overheat the sugar syrup, this may cause issues down the line, such as wrinkly macarons.
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Transfer the syrup to the bowl of a stand mixer.
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With the whisk attachment, start whisking mixture on low for about 30 seconds, then gradually start increasing speed to medium. Whisk on medium for one to two minutes, until the mixture is white and starting to become fluffy. Raise the speed to high, or medium-high and whisk for a few minutes until stiff peaks are formed. Best way to check this is to keep your eye on the whites. Once they get glossy and you start seeing streaks formed by the whisk, it might be time to stop.
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Whisk until stiff peaks have formed. When you pull your whip up, the peak should be stiff and shooting straight up, with possibly a slight bend at the top, but not bending down to the side.
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Pour the sifted powdered sugar and almond flour into the stiff meringue.
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Add the food coloring at this point, if using. I added some green leaf gel food coloring.
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Start folding gently forming a letter J with a spatula.
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How to know when to stop folding the batter: It’s time to stop folding when the batter is glossy and has a thick and flowing consistency. There are several ways to test this.
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First, pick up some batter with the spatula and try to draw a figure 8 with the batter that is dripping off the spatula. If you can form several 8 figures without the batter breaking up, that’s one indication that it might be ready.
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There’s another test you can do. I call it the Teaspoon test.
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Grab a teaspoon of batter and spoon onto the parchment paper or silicon mat. Wait a minute to see how it behaves.
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If the batter stays stiff, forming a point and doesn’t spread out, fold a little bit more, about 3 folds. Test again.
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Once the batter spreads out a bit and starts to look glossy and smooth on top, on the parchment paper or silicone mat, it’s ready.
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You don’t want your batter to be too runny either. So be careful not to overmix. It’s always best to undermix and test several times until the proper consistency has been achieved.
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When you hold the spatula with batter on top of the bowl and the batter falls off the spatula slowly but effortlessly the batter is ready. The batter will keep flowing off the spatula non-stop, but not too quickly.
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Transfer the batter to the piping bags, you will need less batter on the piping bag fitted with the tip number 3 since you will only be using that batter for the stem.
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Place the piping bag with the number 8 tip at one of the rounded parts of the shamrock leaf, and apply pressure as you move the piping bag towards the center. Move the piping bag to another rounded outer edge and repeat the motion. It’s a pretty similar motion to piping the hearts that I have taught you before. But this time you will pipe several hearts that will meet in the center.
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Now set the piping bag aside and grab the smaller tip one, and pipe the stem.
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Frequently tap the tray against the counter or against the palm of your hand, which will help the batter spread out.
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Use a toothpick to pop any air bubbles and also to drag the batter to the outer edges and smooth out any bumps.
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Let the trays sit for a while so the shells will dry out. I usually leave about 20-40 minutes, depending on how humid the day is. Since I added a lot of color to these shamrocks, I had to leave them resting for nearly one hour. You’ll know they’re ready when you gently touch the surface of a macaron and it seems dry.
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Pre-heat the oven to 325ºF.
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Bake one tray at a time.
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Bake for 5 minutes, rotate tray.
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Bake for 5 more minutes. Rotate again.
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I bake each tray for about 15 to 20 minutes.
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When baked, the macarons will have a deeper color and formed feet. If you try to move a macaron, it shouldn’t feel jiggly. If the macaron is still jiggly, keep baking.
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Remove from the oven and bake the other tray.
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Let the macarons cool down before proceeding with the filling.