This lemon royal icing is so incredibly delicious. It tastes like lemonade- sweet and tangy without being sour. I paired it with my Meyer lemon sugar cookies and it was so delicious.
6 Tbsp meringue powder
1 tsp Diamond Crystal kosher salt (or 2 tsp regular table salt)
1/2 cup lemon juice
2–4 Tbsp water, as needed
2 lb powdered sugar
1 tsp vanilla extract or paste
1 tsp lemon extract, optional
2-4 Tbsp corn syrup (I use 85g, which is ¼ cup / 4 Tbsp)
white gel food coloring, optional
To the mixing bowl, add the salt, meringue powder, and lemon juice. Use a wire whisk to combine, making sure there are no lumps of meringue powder in the bowl. The mixture will be frothy on top with liquid on the bottom, kind of like beer.
Add the powdered sugar to the bowl all at once. Attach the bowl to the mixer fitted with the paddle attachment and mix on low to combine into a thick, syrupy icing. If the icing is very dry and not coming together, add an additional 2 Tbsp water and mix again. Add the vanilla, any other flavorings you are adding, corn syrup, and a squeeze of white gel food coloring. Mix again, raising the speed to medium (four on the Kitchen Aid) for three minutes. The icing will be thick, glossy, and fluffy.
Cover the icing with cling film immediately, touching the surface. You could also cover it with a moist towel draped over the bowl if you’re going to be using it immediately. If you’re making it ahead, store it in an airtight container.
The consistency of the icing will be a toothpaste/piping/detail consistency. Color it and thin it out as needed for decorating. If you can handle more lemon flavor, feel free to thin out the icing with even more lemon juice rather than water!
Find it online: https://linenandgray.com/lemon-royal-icing/