Stir the yellow powder color into the room temperature water. Combine the colored water with the powdered macaron mix by hand. In the bowl of a stand mixer that is fitted with the paddle attachment, mix on high speed for 4 minutes. Pipe the mixture onto a sheet pan that is lined with a Silikomart Macaron Baking Sheet (591063). Allow the macaron batter to set at room temperature for 45 minutes to form a skin. Then bake at 300ºF/149ºC for 15 to 18 minutes.
In the bowl of a stand mixer that is fitted with the paddle attachment, combine the buttercream base with the softened butter. Mix on high speed until smooth. Scrape down the sides of the bowl and then slowly add the water. When the water is fully incorporated, add the lemon paste. Mix well to incorporate the flavorings throughout the buttercream.
Assembly
Pipe the Lemon Buttercream Filling onto the Yellow Macaron Shells and then sandwich with another shell. Serve as desired.
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