My sister and I were at an amazing little french fries "manufacture". That's what they call themself. It's a mix between a hip restaurant and a diner. They have a big range of Poutines with guacamole, vegan bolognese, meat, sour cream or champagnions in an cream sauce. They have normal fries, garlic fries and sweet potatoe fries to chose from. They also some amazing sauces like a lime mayo which is amazing! You can also have classic chili cheese fries or something different if you don't want fries or want some more: currywurst, meatballs or coleslaw. So something for vegans, vegetarians and meat eaters.
My sister and I had the "Tijuana Street Fries". It's a big bowl of normal fries (we didn't wanted the garlic fries). We also had an amazing fresh guacamole on top, a sour cream which wasn't to heavy it almost taste like yoghurt and some tomatoes with a "Bruschetta" like tast. It was really nice!
You can find the restaurant "Frittenwerk" in Dusseldorf, Cologne and soon in Aachen.