Wholesome Brisket With Roasted Vegetables

• 5 brisket
• 3 1/2 roasting (pan)
• 3 onions
• 1 head garlic
• 1/4 reserved roasting liquid
• 450 gr tomatoes with liqui (whole)
• 250 gr carrots
• 120 ml water
• 60 ml water
• 20 ml olive oil