I'll start: Hessian 'Tater soup. Maybe not very exciting, but I just love the stuff.
Start off with a diced onion and about 1 - 1.5 kg of peeled, sliced potatoes. Throw into a big pot on high heat with some oil and let it develop some color. Meanwhile, get peeling and chopping on this stuff - carrots, celery root, leek, parsley, parsley root. Amounts as desired, but I like to use a lot of parsley - root or leafs. If your taters get enough color, cover with water and add the rest of the veggies. All that in place, cook until soft. Blend. Add 200ml of sour cream and season with nutmeg, pepper and salt. Consistency should be thick, maybe slightly chunky.
When serving, fry up a few slices of old sausage to throw in there. This one is a traditional north hessian sausage, but any only lightly spiced and smoked, coarse ground, fatty hard sausage will do. Add a sprig of parsley if you feel like upping the presentation.