Make schnitzel with mushroom gravy with Christian

Ingredients

• 4 veal cutlets
• 1 lb button mushrooms
• 1 onion
• 1 clove garlic
• 2 tbsp vegetable oil
• 2 tbsp unsalted butter
• 1 cup flour
• 1/4 cup chicken stock
• 1 cup heavy cream
• 1 egg
• 3 1/2 oz panko breadcrumbs
• 1/3 cup clarified butter
• salt
• pepper
• parsley (for serving)
• lemon (for serving)