Italian-style Pot Roast

• 4 venison pot roast
• 2 tbl of water
• 1 onion
• 1 clove garlic
• 240 ml dry wine (red)
• 230 ml tomato sauce
• 190 gr tbl of flour for of liquid
• 100 gr celery
• 18 gr fat
• 4 gr oregano