Mushroom Soup with Potatoes

Ingredients

• 300 g Potatoes
• 150 g Mushrooms
• 1 pc Onion
• Salt
  to taste
• Seasoning
  to taste
• Caraway seeds
  to taste
• 3 pc Bay leaves
• 100 ml Semi-skimmed milk
• 1 tbsp All-purpose flour
• 100 g Butter