Heat olive oil in a large pot. Add the shallots and saute them. Add garlic and potatoes and fry them for a few minutes.
Add passata, bay leave and chopped parsley, cook over low heat for about 20 minut, until potatoes soften and the sauce thickens.
Season with sugar, salt and pepper. Pour the wine, add mussels and shrimp. Cook for 5-7 minut, until the mussels open.
Sprinkle with chopped parsley.