Fried Horseradish Breaded Fish With Mashed Po

• 4 firm fish fillet (white)
• 2 egg
• 2 leek
• 2 potato
• 240 ml puritan oil
• 65 gr butter
• 60 gr horseradish
• 55 gr seasoned bread crumbs
• 60 ml oil
• 45 ml water