![](https://media.scoolinary.app/recipes/images/2022/03/Smashed-burgers-768x512.jpg)
● 1 escarole lettuce
● 2 sticks of celery
● 100g clarified butter
● 50g old Dijon mustard
● 3 egg yolks
● Oil
● Vinegar
● Salt
● 1 whole cow’s brain
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