In a large stock pot melt butter and saute garlic. Add onions, potatoes, white wine, bay leaf, dill, thyme, salt and pepper. Cover and simmer for approx 5 min.
Add fish, scallops and prawns and simmer for an additional 5 min. Add the evaporated milk and allow to heat through for approx 30-35 min. Do not allow to boil. Remove bay leaf before serving.