Monday, January 14, 2013

Blueberry Macarons



Sometimes simplicity is what makes something special.

These pretty macarons are filled with just blueberries and buttercream. I even omitted the vanilla in the buttercream recipe so that the flavor of blueberries would be front and center.


The shells are colored with a few drops of royal blue food coloring.  The color of the macaron shells always lightens after baking so be sure to color your batter a bit darker than you'd like them to turn out.

Blueberry Macarons
180g ground almonds, sifted
270g powdered sugar, sifted
150g egg whites, aged 2 to 4 days in the fridge and then brought to room temperature
100g granulated sugar
royal blue food coloring

Line four heavy baking sheets with good quality parchment paper and set aside. Also, set aside two pastry bags for the piping of the macarons.

Sift together your ground almonds with the powdered sugar and set aside.

Whisk the egg whites (at room temperature) to glossy firm peaks adding the granulated sugar gradually in four parts.  Towards the end of mixing, add the food coloring.

Incorporate the dry ingredients into the beaten egg whites using a large rubber scraper.  Mix well. 
Fold the mixture with the rubber scraper by pulling down the sides and flipping the mixture over. Do this until you have a smooth mixture that falls like a “ribbon” off the scraper.

Transfer the mixture into the two piping bags. Use rubber bands to close the piping bags. Clip the tip of the bags, one at a time, and pipe small quarter sized rounds, leaving 1-inch of space between each because they spread as they set.

Leave to set for about 30 minutes or until the top has formed a crust and is not sticky to the touch.
Macarons resting before baking.
While they are setting, preheat the oven to 325 degrees. A convection oven is preferable. 

Bake one sheet at a time in the center of the oven for about 12 minutes or until the cookie is firm, matte and doesn't wobble when touched.
Leave on the baking tray until cool then lift them all off the parchment carefully. You may need to use a thin knife to help lift them off.

Sort into pairs and fill with Blueberry Buttercream. 
 

Blueberry Buttercream
1 cup frozen blueberries
1/4 cup sugar
1 heaping teaspoon cornstarch
3 egg whites
1/3 cup granulated sugar
1/8 teaspoon cream of tartar
1 cup unsalted butter, room temperature
pinch of fine sea salt

Combine the blueberries, sugar and cornstarch in a saucepan. Over medium heat, stirring constantly, cook the berries until they are bubbling and begin to thicken (7 to 10 minutes). With a potato masher, smash the berries as much as possible and keep cooking for 5 to 7 minutes. You want the berries to resemble a very thick jam.

Transfer the berries to a bowl and let cool completely.
The blueberry mixture cooling.

The finished blueberry buttercream.
Place the whites in a clean mixing bowl. Whisk in sugar and cream of tartar.

Place bowl over a double boiler on medium heat, stir frequently until the mixture is very hot (120 to 130 degrees Fahrenheit).

Move to mixer and whip whites on high for 2 to 3 minutes; turn down to medium low until cool (use the bowl as your guide).

In a separate bowl with a wooden spoon, stir butter to soften.

With mixer on medium/high speed, add the butter one tablespoon at a time, adding the next tablespoon just as the previous one is blended in. Once all the butter incorporated, add in the salt and whip on high speed until fluffy. Add the blueberry mixture and whip again until thoroughly combined.





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