Curried Potato Chowder

• 2 russet potatoes
• 2 bread
• 700 ml beef stock
• 450 gr onions
• 100 gr nonfat yogart (plain)
• 75 gr corn kernels
• 60 ml dry wine (white)
• 16 ml dry english mustard
• 3 gr turkey bacon
• 1 gr sugar