Manhattan Island Clam Chowder

• 24 littleneck clams
• 6 tomatoes (fresh)
• 1 onion
• 700 ml water to the stockpo
• 240 ml dry wine (white)
• 100 gr cracker crumbs
• 65 gr pork fatback
• 7 gr parsley (fresh)
• 5 gr butter
• 2 gr thyme (dried)