whole boneless beef chuck roast, cut into 3 steaks • white button mushrooms, quartered • medium carrots (10 ounces; 275g), 2 left whole, 2 cut into bite-size pieces • Baby Yukon Gold potatoes, halved • small celery (3 ounces; 85g), sliced • medium cloves garlic, peeled diced • large yellow onion (10 ounces; 275g), peeled, split in half • frozen or fresh pearl onions (thawed if frozen, peeled if fresh) • frozen peas • chicken stock • tomato paste (2.5 ounces; 75g) • powdered unflavored gelatin (1 ounce; 30g) •