My favourite thing about these macarons is that bitters buttercream. I didn't know if it was going to work, but it ended up tasting so much better than I expected. Mixing it into the Swiss meringue buttercream gave it a beautiful velvety texture, and the slight bitter, spicy and fruity flavour worked magnificently when combined with the sweetness of a macaron shell. I will definitely have to experiment with more bitter flavours in macarons from now on. Much love to Lisa & Karen for coming over to brainstorm and bake with me, it was so fun and will definitely be repeated. Our combined baking Brains Trust is a force to be reckoned with, watch out world!
Lemon, Lime & Bitters Macarons
(makes about 42 macarons, feel free to halve the amounts)
2 x 100g aged egg whites (you can use fresh eggs too, just make sure they are room temperature. I always use fresh these days, and zap it in the microwave on defrost for 10 seconds)
2 x 110g almond meal, dried in a cool (100 degrees C or less) oven for 5 minutes and sifted
2 x 200g icing sugar
2 x 50g caster sugar
Optional: 2 x 1 tsp powdered egg whites (available from The Essential Ingredient), helps to stabilise egg whites but is not necessary
green and yellow powdered/gel food colouring
zest of one lemon
zest of one lime
For the bitters buttercream:
2 egg whites
1/2 cup caster sugar
180g unsalted butter
About 2 tbsp bitters, adjust to taste
(If you're new to making Swiss meringue buttercream, these wonderful tutorials from two of my favourite bloggers will help)
For the lemon-lime curd (optional):
Prepare the lime curd from this recipe, replacing half the lime juice and zest with lemon (you will end up with a lot more than you need, but stay tuned for a recipe that will use up the leftovers!)
This recipe involves preparing two separate batches of macaron shells, one with lime and one with lemon, hence the '2 x' amounts listed in the ingredients. Prepare the lemon shells first, using half the egg whites, almond meal, icing sugar, caster sugar and egg white powder. Line baking sheets with baking paper. Place icing sugar in food processor and pulse for a minute to remove any lumps. Stir in almond meal and pulse for about 30 seconds to combine. Place in a large mixing bowl and set aside. Using an electric mixer, beat egg whites and egg white powder in a medium mixing bowl until the egg white powder dissolves and it reaches soft peaks. With the mixer on high speed, gradually add sugar and beat until it reaches stiff peaks. Add yellow food colouring at this point.
Add meringue and lemon zest to your dry mixture and mix, quickly at first to break down the bubbles in the egg white (you really want to beat all the large bubbles out of the mixture, be rough!), then mix carefully as the dry mixture becomes incorporated and it starts to become shiny again. Take care not to overmix, the mixture should flow like lava and a streak of mixture spread over the surface of the rest of the mixture should disappear after about 30 seconds. Place in a piping bag and pipe rounds of about 3cm diameter on baking sheets. Tap baking sheets carefully and firmly on the benchtop a couple times to remove any large bubbles.
Leave to dry for about half an hour, so that when you press the surface of one gently it does not break. This will help prevent any cracking and help the feet to form on the macs. Repeat the process above for the lime shells, adding green food colouring instead of yellow and lime zest instead of lemon zest. Preheat your oven to 140-150°C (285-300°F), depending on your oven. Place on top of an overturned roasting tray or another baking sheet if your sheets are not professional grade, for better heat distribution. Bake for 15-20 minutes, depending on the size of your shells. Remove from the oven and cool on the tray for a few minutes, then gently remove from the sheet and place on a wire rack to cool completely. While waiting for them to cool prepare the lemon lime curd as described in the other recipe and chill in the fridge. Prepare the bitters buttercream; place caster sugar and egg whites hisk together egg white and sugar in a large heatproof bowl. Clip a candy thermometer to side of bowl. Set bowl over a pan of simmering water, and whisk until mixture reaches 70°C (160°F) and sugar has dissolved, about 5 minutes.
With a mixer fitted with the whisk attachment, beat egg white mixture on high speed until cooled and thick, about 5 minutes. Reduce speed to medium, and add butter, 1 tablespoon at a time, beating until incorporated after each addition. If mixture is runny at this point, refrigerate for 10 minutes and then continue beating until it starts to hold its shape (this can take a while). Mix in bitters gradually, taste testing as you go. You want the bitters flavour to be quite strong, as it will mellow when sandwiched between the macaron shells. Spoon or pipe buttercream on to macaron shells, sandwiching one lime and one lemon shell together for each macaron with a small dab of lemon lime curd in the centre. Refrigerate overnight in an airtight container to allow the flavours to mature, serve at room temperature.
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