After reading all the praises of this type of frosting, I had to give it a try. I am so glad I did! My all time favorite frosting is RLB's silk meringue buttercream which has a custard base and is wonderful. It is a little more time consuming to make, and the final product is very ivory in color, but is my go to recipe. You can add just about anything to it, and it makes the best chocolate frosting. Needless to say, I was skeptical about trying anything else, but I was surprised! I tried Toba Garret's recipe and it was delicious. It is lighter in flavor than the silk meringue buttercream but also has that custard flavor without being too sweet or buttery. (I made it with all butter). It smoothes and pipes beautifully. Also, it has no eggs if that is an issue, and is a much lighter more versatile ivory color. I took it to work and it sat out for about 3 hours before it was gone, and the frosting held up beautifully. It didnt get soft or slumpy at all. Everyone really liked it. I used it as the filling as well, and it cut cleanly and didnt squeeze out the sides. I will be seeing what can be added to it for variety.
To avoid lumps, I heated the milk and sugar in a large glass measuring cup in the microwave until just boiling (watch carefully, boils over easily). Then I poured 2 to 3 Tbsp of the hot milk into the flour and mixed until a very smooth paste. Then I added a few tablespoons more of the hot milk, mixing until completely smooth. Then I mixed the flour into the rest of the milk. I placed the measuring cup in an ice bath and stirred occasionally until cooled. I poured it through a strainer into the mixing bowl, although there were virtually no lumps. Then I completed the buttercream as directed.
It came out beautifully smooth, with no lumps and no food processor! The photo is a quick 5 minute frosting job - just a few times over with the scraper and a quick piping, so I could get out the door and off to work with it (my colleagues are eager to help me dispose of my experiments)! This recipe definitely goes in my file, and maybe the initial mixing technique will help with the lump issues!