Brush the mussels well under cold running water, removing the "beards". Discard open mussels. Peel and chop the onions. Peel, wash and chop the carrots. Wash thyme
Heat 2 tablespoons of butter in a saucepan. Brown the onions and carrots in it. Season with salt and pepper. Add thyme, wine, 1/4 l water and lemon juice, bring to the boil. Cover the mussels and cook them for about 10 minutes. Shake pot in between
Wash and chop the parsley. Drain the mussels and collect the stock. Throw away closed mussels
Sauté the flour in 1 tbsp. hot butter until light yellow. Stir in the mussel stock, bring to the boil and simmer for about 5 minutes. Add saffron and parsley. Season to taste. Arrange mussels with the sauce. Tastes good with fresh white bread
Drink: cool white wine