Pound meat: Place the meat between two pieces of cling film on a cutting board. Pound them carefully to make them thinner, about 0.2 inch/ 5 mm. Season lightly with salt and pepper on both sides.
Prepare mushrooms: Clean them with kitchen paper (Note 2). Slice and set them aside.
Cook veal: Heat a large cast-iron or nonstick pan. Add olive oil and ½ tablespoon of butter to the pan. Add peeled but still whole garlic clove and stir for 1 minute. Add cutlets and fry them on medium-high heat for 1 – 1 ½ minutes per side. Remove, sprinkle with salt, and keep warm. Remove the garlic clove as well.
Cook mushrooms: Melt 1 tablespoon of the butter in the pan. Fry mushrooms on medium heat, often stirring, for 2-3 minutes until golden. Pour in Marsala and let bubble for 1 minute. Cut the remaining ice-cold butter into small cubes and stir them slowly into the sauce. Season with salt and pepper.
Finish: Return the veal to the pan and reheat gently for about one minute. Serve immediately.
Notes
If the cutlets are larger but just as thin as the ones I use, the cooking time will not change.
One tablespoon of the butter should be ice-cold; it will help emulsify the sauce.
Don’t wash the mushrooms; they will soak too much water and become soggy. Instead, rub them clean with kitchen paper, it takes longer than washing, but it is worth it.