NOTE: If possible, make this frosting 1-3 days in advance. As you let the frosting come to room temperature, let it sit out overnight at room temperature to develop a super deep red color. Beat the butter on a medium speed for 30 seconds with a paddle attachment, until smooth.
Mix in the vanilla extract, almond extract (optional), and fine salt on a low speed.
Slowly add in the powdered sugar, 1 cup at a time. Halfway through, add 3 tablespoons of heavy cream to make the frosting easier to mix.
Beat on low until the ingredients are fully incorporated and the desired consistency is reached.
If the frosting is too thick, add additional cream (1 Tbsp at a time). If the frosting is too thin, add in more powdered sugar (quarter of a cup at a time).
Start by mixing 1 tsp of red gel food coloring or 2 tsp of powdered food coloring into the frosting once it's fully made, and add more as needed. Beat on low until it reaches the desired color. Powdered food coloring can be mixed directly into the frosting. It avoids bitterness well, but you’ll usually need more of it than gel color.
To allow the shade to deepen, place in sealed piping bags or an airtight container and leave out at room temperature for a few hours or overnight. Then use as desired or place in the fridge until you're ready to use.