Paella A La Valenciana

• 12 little neck clams
• 2 onion (whole)
• 1 broiler
• 1 bay leaf
• 1,400 ml chicken stock
• 350 gr short rice (grain)
• 260 gr chorizo sausage
• 250 gr shrimp
• 240 ml dry wine (white)
• 160 gr tomatoes (chopped)