400 g Swiss brown mushrooms
2 yellow onions
4 garlic cloves
1/2 cup sour cream
1/2 lemon
1/2 bunch fresh dill
1/2 bunch fresh thyme leaves
2 tsp Hungarian sweet paprika (or ground paprika)
4 tbsp unsalted butter
1 tsp salt
1/2 cup dry white wine
3 cups low-sodium vegetable broth
2 tbsp Worcestershire sauce
1 cup whole milk
2 tbsp plain flour