Udon Noodles with Japanese Clam Sauce

Name: Udon Noodles with Japanese Clam Sauce
Ingredients: 1 package udon noodles; 1 pound littleneck clams; 1/4 cup cooking sake; 3/4 cup regular sake; 3 tablespoons light olive oil; 2 tablespoons butter; 1/2 small yellow onion, chopped; 2 tablespoons grated ginger; 3 cloves garlic, chopped; 1/2 teaspoon hot pepper flakes; 2 small seeded and chopped tomatoes; 3 tablespoons finely chopped flat-leaf parsley; Salt to taste; 1/2 cup whipping cream; 1/2 cup clam juice (from the steamed clams)