One of the few dishes that I have been preparing regularly for several years since I moved out from my parents' place and that I can eat at any moment even several times in the same week is the lentils soup.
I don't remember any more what the origins of this recipe are, I just remember the many many times that I could share this amazing soup with my friends and family and loved ones, and everybody seemed to enjoy it as much as I did.
It does help that it's an incredibly easy recipe, it just takes a bit of time for cooking but the preparation is basically none. As for tools you'll just need a big pot possibly with an (heavy) lid, a big spoon/ladle, and a knife.