Preheat a 4 quart pot over medium high heat.
Saute onions and a pinch of salt in oil until until translucent, 4 to 7 minutes. Add garlic, for about a minute, until fragrant.
Add carrots, wine, rosemary (crushed in your fingers), thyme (crushed in your fingers), paprika, fennel, fresh black pepper and salt and bring to a boil. The liquid should reduce in about 3 minutes.
Add porcinis and vegetable broth, cover and bring to a full boil for 5 minutes or so, to quickly cook the procinis. Now add the potatoes, lower heat and bring to a simmer (not a full boil). Let the potatoes cook just until fork tender, about 15 minutes.
In a measuring cup, mix the flour into the water with a fork until no lumps are left. Slowly add the broth/flour to the pot, mixing well. Mix in the tomato paste. Let thicken for 5 minutes or so. Add the sausages and continue to cook. In about 5 more minutes it should be perfectly thick but still smooth. Taste for salt and seasonings, and serve! Sprinkle individual servings with fresh parsley if you want to be 70s food chic.