Clean the mushrooms with a damp cloth and chop them into medium-sized pieces.
Melt the butter in a soup pot over medium heat. Add the onions and cook until they’re soft, about 5 minutes.
Add the mushrooms, paprika, and white wine. Allow the mixture to cook for another 5 minutes, stirring frequently.
Next stir in the stock and soy sauce. Cover the pot and let everything simmer for 10 minutes. We don’t want it to boil, so lift the lid and check it occasionally. Turn the heat down a little if it’s boiling.
While the soup is simmering, whisk the flour and milk together in a separate small pan. We’re going to use it to thicken this mushroom soup.
After 10 minutes of simmering, slowly add the flour/milk mixture. Allow the whole thing to cook together for about a minute, stirring frequently.
Remove from heat and stir in the lemon juice. Add salt and pepper to taste and serve. Yum!
