Balkan Vegetable Stew

• 2 onions (sliced)
• 2 garlic (cloves minced)
• 1 head cauliflower florets
• 1 head cabbage
• 1 green pepper in (cut)
• 1 eggplant cubed
• 1 zucchini (sliced thin)
• 525 gr green beans (cut)
• 240 ml vegetable broth
• 180 ml milk