I happened to have some black garlic that I bought with no idea what to do with it until I saw this recipe. I didn't have time to make the frites, but made the steak and butter and it was easy to prepare and delicious. The butter was slightly sweet and surprisingly complex for only 3 ingredients. I used a mini food processor because my garlic didn't mash easily with good results. Impressive, simple dish that was a nice end to a busy weekday.
I followed this recipe exactly except I used Canola Oil instead of Peanut Oil which it suggested as an alternative, the Frites were a sloppy mess and never fried. I had to throw them away. The butter is tasty, but this was a huge disappointment.