Beef Stew With Shiitake Mushrooms And Baby Vegetables

• 30 baby carrots trimmed
• 12 baby pattypan squash (halved)
• 2 onions (chopped)
• 2 cans beef broth
• 1,400 gr trimmed beef chuck (boneless cut into)
• 700 ml dry wine (red)
• 425 gr baby skinned potatoes quartered (red)
• 160 gr shiitake mushrooms stemmed caps thickly (fresh sliced)
• 85 gr butter
• 65 gr tomato paste