Heat the olive oil in a large pot and add the chopped onion.
Saute for a couple of minutes, then add the cubed potatoes.
Cover the potatoes with water (about 2 to 2 1/2 cups, or more depending on your pot size).
Add the sliced carrots, bay leaves, sweet paprika, thyme, salt, and pepper. Let it cook until the vegetables are tender, about 20 minutes.
Stir in the whole wheat flour, which you have dissolved separately in a cup with some cold water.
Add the canned chopped tomatoes and the fresh tarragon. Stir and cook for another 5 minutes, until the stew thickens.
Serve with fresh parsley on top!