Barley-vegetable Casserole

• 5/8 barley
• 1/4 pcs
• 600 ml water
• 140 gr cauliflower (chopped)
• 130 gr carrots (finely shredded)
• 120 gr onions (chopped)
• 85 gr mushrooms (chopped)
• 10 ml vegetable broth vegetarian
• 1 gr garlic powder
• 1 gr pepper