In a medium saucepan over low heat, sauté the onions with the butter, dill seed, chopped dill and oregano. Add the flour, stirring for 2 minutes. Gradually stir in the tomatoes, alternating with the vegetable stock. Add the sea salt, white pepper, and parsley. Raise to medium heat and bring to a gentle boil; reduce the heat and simmer for 15 minutes.